单项选择题

It was in that lab ______ they did the chemical experiment.

A. which
B. where
C. that
D. what
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单项选择题
The medicine has many functions, ______ are unknown to us.
A. some of that
B. some of them
C. some of which
D. some of what
单项选择题
He gave up his job ______ for his family and for himself.
A. both
B. all
C. much
D. little
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