单项选择题

John is ____ the age of Mary.

A．old
B．twice
C．double
D．as old as
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单项选择题
____ for your help, we wouldn’t have succeeded.
A．Hadn’t it been
B．had it not been
C．If it had been
D．if it were
单项选择题
_____ difficulties we may come across, we will help one another to get them over.
A．whatever
B．whichever
C．however
D．what
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