单项选择题

He saw the only lighted window on the third floor ______ black.

A．go
B．went
C．to go
D．gone
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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
单项选择题
Delaying the problem too long won't help ______ it.
A．solving
B．solve
C．to solve
D．solves
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