单项选择题

I think I saw Mary ______ in the library last night.

A. working
B. worked
C. to work
D. works
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单项选择题
I went to the school with a view to ______ a visit to my former tutor.
A. pay
B. paying
C. have paid
D. being paid
单项选择题
It is no good ______ to come now. He is busy.
A. asking him
B. to ask him
C. if you ask him
D. that you ask him
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