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【题目】This Physics problem is so difficult that I ______ if someone can work it out.

A.believeB.doubtC.guessD.admire

【答案】B

【解析】

句意:这道物理题太难了,我怀疑是否有人能解出来。

考查动词辨析。believe相信;doubt怀疑;guess猜;admire钦佩,根据所给空后面的if someone can work it out可知,应该是怀疑,故选B

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