单项选择题

—Shall Brown come and play computer games
—No, ______ he has finished his homework.

A. when
B. if
C. unless
D. once
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单项选择题
I have two grammars, ______ are of great use.
A. all of which
B. either of which
C. both of that
D. both of which
单项选择题
Do you know the man ______
A. whom I spoke
B. to who spoke
C. I spoke to
D. that I spoke
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