单项选择题

Scientists say that many factors ______ changes in the weather.

A. bring in
B. bring off
C. bring about
D. bring forward
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单项选择题
It was the first time that Mary was late. She ______ up in the traffic.
A. could be held
B. can have been held
C. might have been held
D. might be held
单项选择题
I have given up trying to convince him; there is no point ______ with him.
A. on arguing
B. in arguing
C. to argue
D. for arguing
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