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【题目】The doctor looks tired and sleepy ____he stayed up late to look after his patients yesterday.

A. ifB. becauseC. whileD. so that

【答案】B

【解析】

句意:医生看起来又累又困,因为他昨天熬夜照顾病人。A. if如果;B. because因为;C. while当……的时候; D. so that为了,目的。根据下文he stayed up late to look after his patients yesterday.可知这里是表示原因,用because,根据题意,故选B

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