【題目】 He seldom looks happy because he___________ a lot.

A. worry B. worries

C. worry about D. worries about

【答案】B

【解析】

試題分析：句意：他很少看起來(lái)開(kāi)心，因?yàn)樗偸菗?dān)心。worry 擔(dān)心，動(dòng)詞原形；worries第三人稱單數(shù)形式；worry about 為……擔(dān)心；worries about三單形式。根據(jù)句意可知，這里并沒(méi)有說(shuō)擔(dān)心什么事，因此不用介詞about，而且主語(yǔ)he是第三人稱單數(shù)形式，故應(yīng)選B。

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