单项选择题

John's completely unaware how much damage he did the company, ______

A．didn't he
B．did he
C．isn't he
D．is he
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单项选择题
Whatever you do, you ______ click with the right mouse button or the program will crash.
A．must not
B．don't have to
C．doesn't have to
D．needn't
单项选择题
I'll contact my office in Chicago straight away and have the contract ______ through to you.
A．faxed
B．repaired
C．done
D．taken
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