单项选择题

You （） her in her office last Monday; she has been out of town for one month.

A. needn’t have seen
B. can’t have seen
C. might have seen
D. must have seen

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单项选择题

Which of the following italicized parts is used as an object？（）

A. What do you think has happened to her？
B. Who do you think the visiting professor is？
C. How much do you think he earns every month？
D. How quickly would you say he would come？

单项选择题

Not until the exam had begun （） at the classroom

A. should he have arrived
B. had he arrived
C. did he arrive
D. would he arrived