单项选择题

Scientists say that many factors ______ great changes in the weather.

A．brought about
B．brought on
C．brought up
D．brought forward
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单项选择题
Apparently, they are ______ happy to hear of his successful escape from the prison.
A．more
B．more than
C．other than
D．rather than
单项选择题
The dispute over the border area reached a point ______ both countries had to resort to arms.
A．to which
B．on which
C．that
D．where
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