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
The train from this station ______ on time. People have become tired of that.
A．never leaves
B．never left
C．is never leaving
D．is never left
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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