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---Are you sure you have to do it? It’s been very late.
-----I don’t  know ________I can do it if not now.
A .where           B. why          C. when
C

试题分析:—你确信你必须做这件事吗?现在已经太晚了。—我不知道如果现在不做什么时候我能做。根据句意是什么时候,所以选when,故选C。
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