单项选择题

He ran back into the room to see if he ______ anything behind.

A．has forgotten
B．had forgotten
C．has left
D．had left
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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
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
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