单项选择题

The students were required to write an article to （） the claim that the earth is not round.

A.retain
B.refute
C.deny
D.dispute

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I would have seen him off, had it been possible but I （） so busy then.

A.had been
B.were
C.was
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单项选择题
The new facts throw some light （） the matter.

A.at
B.in
C.on
D.of
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