单项选择题

Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.

A．a few of it
B．a few of that
C．a few of them
D．a few of which
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单项选择题
Jack is very exhausted, he should stop ______ and go out for a rest.
A．to study
B．studying
C．of studying
D．to have studied
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