单项选择题

______ for you help, we’’ d never have been able to get over the difficulties.

A．Had it not been
B．If it were not
C．Had it not
D．If we had not been
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单项选择题
Please_________from smoking until the aeroplane is airborne.
A．refrain
B．prevent
C．resist
D．restrain
单项选择题
These people once had fame and fortune; now______ is left to them is utter poverty.
A．all that
B．all what
C．all which
D．that all
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