英语高手进来啊~~~

when表示一个时间点
during表示一个时间段
区别二者主要看句意，如果明显是一段时间就用后者，如果明显是一个时刻如5点就用前者。
此题选A啦
牛津高阶英汉双解词典

while 1
/ waɪl; US hwaɪl; hwaɪl/ n [sing]
(period of) time （一段）时间: She worked in a bank for a while before studying law. 她学法律之前在银行工作过一段时间. * For a long while we had no news of him. 很长一段时间我们没有他的消息. * I'll be back in a little while, ie soon. 我一会儿就回来. * It took quite a while (ie a long time) to find a hotel. 很长时间才找到一家旅馆. * We waited for three hours, all the while hoping that someone would come and fetch us. 我们等候了三个小时, 一直希望能有人来接我们.
(idm 习语) once in a while => once. worth sb's while => worth.
> while v (phr v) while sth away pass (a period of time) in a leisurely way 逍遥自在地度过（一段时间）: We whiled away the time at the airport reading magazines. 我们在机场阅读杂志消磨时间. * It's easy to while a few hours away in a museum. 在博物馆里很容易打发掉几个小时.

while 2
/ waɪl; US hwaɪl; hwaɪl/ (also whilst / waɪlst; US hwaɪlst; hwaɪlst/) conj
(a) during the time that; when 在...期间; 当...的时候: He fell asleep while (he was) doing his homework. 他做着做着功课就睡着了. * While I was in Madrid there was a carnival. 我在马德里的时候正赶上狂欢节. * While (locked up) in prison, she wrote her first novel. 她在狱中写出了第一部小说. (b) at the same time as 与...同时: While Mary was writing a letter, the children were playing outside. 玛丽写信时孩子都在外面玩儿. * He listens to the radio while driving to work. 他去上班一边开着车一边听音乐. * I lived in a hostel while I was a student. 我求学期间住在青年招待所里.
(used to show a contrast 用以表示对比或相反的情况): I drink black coffee while he prefers it with cream. 我爱喝清咖啡而他喜欢加奶油的. * English is understood all over the world while Turkish is spoken by only a few people outside Turkey itself. 英语世界通行, 但土耳其语离开本国就很少有人说了.
(fml 文) although 虽然: While I admit that there are problems, I don't agree that they cannot be solved. 尽管我承认有问题存在, 但我不同意说这些问题不能解决.牛津高阶英语词典

That is your ring(改成否定句)
That isn't your ring

These are her books（改成一般疑问句，并做否定回答）
Are these her books,no,they aren't

Those are his oranges(划线部分提问)
___________
Whose oranges are those?

Those are my backpack(改成否定句)
Those aren't my backpack

This is my watch(改成复数形式)
These are my watches

This is his dictionary(改成复数形式)
These are his dictionaries

This is a pencil case（改成复数形式）
These are the pencil cases

Those are his friends(改成复数形式)
这句已经是复数形式了（单数形式是This is his friend）

These are English books(改成复数形式)
这句已经是复数形式了(单数形式是This is an English book)

That is not your ring.

Are these her books? No, these are not her books.

Which are his oranges?

Those are not my backpack.

These are my watches.

These are his dictionaries.

These are pencil cases.

Those are their friends.

This is an English book.(这句是改为单数形式吧？因为句子本身就是复数形式）

That is not your ring.

Are these her books?

Whose oranges are those?

Those are not my backpack.

These are my watches.

These are his dictionaries.

These are some pencil cases.

Those are their friends.

These are English books.

最后2题本身不就是复数吗

That is your ring(改成否定句)
That isn't your ring.
These are her books（改成一般疑问句，并做否定回答）
Are these her books?
No,they aren't.
Those are his oranges(划线部分提问)
What are those?
Those are my backpack(改成否定句)
Those aren't my backpack.
This is my watch(改成复数形式)
These are our watches.
This is his dictionary(改成复数形式)
These are their dictionaries.
This is a pencil case（改成复数形式）
These are pencil cases.
Those are his friends(改成复数形式)
That is his friend.
These are English books(改成复数形式)
This is an English books.