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
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The doctor recommended that he______a rest for a few days.
A. has
B. will have
C. have
D. had
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He gave up his job______for his family and for himself.
A. both
B. all
C. much
D. little
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