【題目】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：醫(yī)生看起來又累又困，因為他昨天熬夜照顧病人。A. if如果；B. because因為；C. while當(dāng)……的時候； D. so that為了，目的。根據(jù)下文he stayed up late to look after his patients yesterday.可知這里是表示原因，用because,根據(jù)題意，故選B。

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