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[主观题]
Scientists say that many factors ______ great changes in the weather.A.brought aboutB.brou
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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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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