单项选择题

The manager wants to know if they ______ our letter yet.

A．will answer
B．answered
C．have answered
D．had answered
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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
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
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