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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单项选择题
From here, we can see the bridge ______ construction.
A．below
B．under
C．by
D．with
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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
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