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
______ at the station, John found the train had just left.
A．On reaching
B．On arrival
C．At reaching
D．At arrival
单项选择题
It is recommended that the project ______ until all the preparations have been made.
A．not be started
B．will not be started
C．is not started
D．is not to be started
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