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
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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
单项选择题
______ a binding contract last year and it is still valid.
A．We have signed
B．We haven't signed
C．We signed
D．We had signed
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