单项选择题

Prof. Lee's book will show you ______ can be used in other contexts.

A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed
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单项选择题
Give me your telephone number ______ I need your help.
A．whether
B．unless
C．so that
D．in case
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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