我英语很烂，想找高手帮忙，我做英语选择题每次都错很多，能不能帮我解释选这个选项的原因，万分感激~~~~~

1.Since she was trapped in a lift for about two hours a year ago she ___c___ to get back into one.
A. doesn’t dare B. didn’t dare
C. hasn’t dared D. hadn’t dared 选c是为什么啊，我选的D，能否帮我解释一下。
说明：（a)since+从句或短语、for+时间段---用于现在完成时
(b)by+时间点---用于过去完成时
例句：（a)He has not seen her since1990.
He has not seen her since they met last time.
I have been a soldier for three years.
(b）We had learnt 10 English songs by the end of last term.
2. The decorator suggested that he ____a__ up a screen on the window to let in fresh air and keep out flies.
A. fix B. fixed (解释选A的原因）
C. fixes D. fixing
说明：suggest建议，后面多用将来时
所以是：he (would）fix,前面是过去式，后面用过去将来时。并且would 省略了。

那啥 火庸同学回答的非常完全，非常正确，我建议你采取他的回答！