单项选择题

The price of oil ______ from $15 to $18 per tank during the winter season.

A．ranged
B．differed
C．altered
D．repair
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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
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
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