◎ 题干
— The light in his room is still on. Do you know _________?
— To prepare for the coming exam, I think.
A.if he works hardB.why he stays up so late
C.why is he so busyD.when he will stop working
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— The light in his room is still on. Do you know _________?— To prepare for the coming exam, I think.A.if he works hardB.why he stays up so lateC.why is he so…”主要考查了你对  【宾语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。