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
They found the lecture hard ______.
A．to understand
B．to be understood
C．to have been understood
D．to have understood
单项选择题
I remember ______ to Paris when I was a very small child.
A．taking
B．to be taken
C．being taken
D．to take
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