单项选择题

I thought that the three months there ______ us a lot of good.

A．has done
B．have done
C．do
D．had done
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单项选择题
He ______ a book, and now he needs a holiday.
A．has been writing
B．was writing
C．will write
D．wrote
单项选择题
Jack told Mary that he ______ what he was doing during the vacation.
A．had just been asked
B．has just asked
C．was just asked
D．just asked
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