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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单项选择题
Since their method doesn't work, we can （） other measures.

A．fall on
B．fall down on
C．fall back on
D．fall in upon
单项选择题
I would have seen him off, had it been possible but I （） so busy then.

A．had been
B．were
C．was
D．would be
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