◎ 题干
—Are you sure you have to? It's been very late.      
—I don't know _____ I can do it if not now.

A. where
B. why
C. when
D. how
◎ 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“— Are you sure you have to? It's been very late. — I don't know _____ I can do it if not now. [ ]A. whereB. whyC. whenD. how …”主要考查了你对  【连接副词】  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。