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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单项选择题
______ raw materials into useful products is called manufacturing.
A．transform
B．transforming
C．being transformed
D．when transforming
单项选择题
It was ten o’clock ____ he came back.
A．that
B．when
C．so
D．which
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