---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

試題分析：—你確信你必須做這件事嗎？現(xiàn)在已經(jīng)太晚了�！也恢廊绻F(xiàn)在不做什么時候我能做。根據(jù)句意是什么時候，所以選when，故選C。
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