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
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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
单项选择题
______ raw materials into useful products is called manufacturing.
A．transform
B．transforming
C．being transformed
D．when transforming
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