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.
Ⅱ.用括号内词的适当形式填空
1．My phone must have_been_stolen (steal) while I was taking a bus. I can't find it anywhere.
2．The driver who died in the accident could have_survived (survive), but he didn't wear a seat belt.
3．[2019·天津十二校联考]I'm not sure of the reason for the dog's illness, but it may have_been_caused (cause) by eating too much.
4．Mr White should have_arrived (arrive) at 8：30 for the meeting, but he didn't show up.
5．—Why are your eyes so red? You can't have_slept (sleep) well last night.
—Yeah, I stayed up late writing a report.
idi-font-family:"Times New Roman";color:black'>．In_case I forget, please remind me about it.
