单项选择题

______ for your advice, we'd never have been able to overcome 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 have two elder brothers, ______ in the army for ten years.

A．the elder of whom served
B．the older having served
C．the older of which served
D．the elder one has served

单项选择题

I'm sure the letter won't arrive in time ______ it is sent by air.

A．if
B．until
C．because
D．unless

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