单项选择题

______for your help, we' d never have been able to get over the difficulties.

A．Had it not
B．If it were not
C．Had it not been
D．If we had not been

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单项选择题

My sister's professor had her ______her paper many times before allowing her to present it to the committee.

A．rewritten
B．to rewrite
C．rewrite
D．rewriting

单项选择题

I told him how to get there, but perhaps I______ him a map.

A．should have given
B．ought to give
C．had to give
D．must have given

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