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
Delaying the problem too long won't help ______ it.
A．solving
B．solve
C．to solve
D．solves
单项选择题
______ of the two suspects is arrested as most of us have expected.
A．Both
B．Neither
C．None
D．Either
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