Ⅰ.用适当的情态动词填空(包含其否定形式)
1．I didn't see her in the meeting room this morning. She must have missed the meeting.
2．He can't/couldn't have stayed at home this morning. I saw him shopping in the supermarket.
3．“The young man could have left, but he chose to stay and help me，” Prather told CBS News.
4．—You ought_to/should have finished the article last Friday.
—Sorry. I have been very busy these days. Could you give me three more days?
5．You needn't have told me the news. I have already known it.
6．While waiting for the flight, your father may/might have met his colleagues, but I am not sure.
