单项选择题

By the time you came back yesterday, they ______ for London.

A．have left
B．left
C．had left
D．leave
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单项选择题
I've never seen you ______ behind the door.
A．standing
B．stands
C．to stand
D．stood
单项选择题
I hope they ______ the bridge by the time we leave at the end of this month.
A．have built
B．will have built
C．will build
D．are to build
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