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-Are you sure you have to? It’s been so late. Make it another time?
-I don’t know ________ I can do it if not now.
A.howB.whatC.whenD.that
C
考查宾语从句的引导词。根据句意可知这是一个宾语从句。I can do it结构很完整,所以只能用连接副词。结合句意可知C正确。句意:我不知道如果不是现在我什么时候可以做这件事情。
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