单项选择题

It was the training that he had as a young man ______ made him such a good engineer.

A. what
B. that
C. which
D. whoever
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Larry, I can’t give you an answer ______ I think it over, said Joe.
A. when
B. before
C. after
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单项选择题
None of the books and magazines can be ______ from the reading room.
A. taking away
B. taking off
C. taken away
D. taken back
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