I don’t know when he______ tomorrow .When he_____ , I’ll let you know.
A．comes ;comesB．will come ; comes
C．comes ; will come D．came; will come
B

試題分析：句意：我不知道他明天什么時(shí)候回來。當(dāng)他回來的時(shí)候，我將讓你知道。分析第一個(gè)句子體現(xiàn)賓語從句，賓語從句的特點(diǎn)是如果主句是一般現(xiàn)在時(shí)，從句用原來的時(shí)態(tài)，明天體現(xiàn)為將來時(shí)；第二個(gè)句子為when引導(dǎo)的時(shí)間狀語從句，體現(xiàn)為主將從現(xiàn)的原則，從句的主語是第三人稱單數(shù)，因此用comes.故選B
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