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【题目】—The light in his room is still on.Do you know________?

—In order to prepare for the coming exam.

A.if he works hard

B.why he stays up so late

C.why is he so busy

D.when he will stop working

【答案】B

【解析】

试题分析:句意为:---他房间的灯还亮着,你知道他为什么熬夜吗?---为了准备即将到来的考试。本题考查的是宾语从句,在宾语从句中,从句应用陈述句语序。结合选项,why表示原因,if表示假设,when表示时间。根据语境可知应选B。

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