单项选择题

A knock at the door again! It was the third time someone（）me that evening.

A. has interrupted
B. had interrupted
C. to have interrupted
D. would have interrupted

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单项选择题
This is so difficult a problem that the scientist is known to（）on it for about ten years, but hasn't found an answer yet.

A. have worked
B. have been working
C. be working
D. work on
单项选择题
The student I am teaching this year is much more intelligent than（）I taught last year.

A. that
B. one
C. the one
D. those
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