【題目】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：這道物理題太難了，我懷疑是否有人能解出來(lái)。

考查動(dòng)詞辨析。believe相信；doubt懷疑；guess猜；admire欽佩，根據(jù)所給空后面的if someone can work it out可知，應(yīng)該是懷疑，故選B。

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