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
I'm afraid I've taken ______ too much of your time.
A．up
B．after
C．in
D．back
单项选择题
I regret ______ so much time and money on stamps.
A．to waste
B．for wasting
C．having wasted
D．at wasting
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