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.
[ ]