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问题: 英语单选问题????

1 I think Father would like to know _____I've beeenup to so far,so I decide to send him a quick note.
A which B why C what D It is
2 Everyone was on time for the meeting-____Chris,who's usually ten minutes late for everything.
A but B only C even D yet
3 -Excuse me,but Iwnat to use your computer to type a report.
-You _____have my computer if you don't take care of it.
A shan't B might not C needn't D shouldn't
4 He accidentally____he had quarreled with his wife and that he hadn't been home for a couple of weeks.
A let out B took care C made sure D made out
(1c2c3a4a)
请讲解一下

解答:

1. be up to something有忙于做某事的意思
句子的意为“我觉得父亲应该想知道我最近都在忙什么”,因此应该用what

2. even在这里是表示强调的语气,相当于汉语的连...都...
全句意思是“所有的人,包括那个平时什么事都迟到10分钟的Chris,都准时到会了。”

3. shall not:不应该
might not:可能不
need not:不需要
should not:不宜

4. let out:泄漏
注意accidentally(意外地)这个词,只有泄漏才符合全句意思
take care:小心
make sure:确保
made out:理解、辨认出等意思