题目内容
?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:C
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题目内容
?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