题目内容

I don’t know if my uncle  _______ . If he _______ , I will be very happy .
A．comes; will comeB． will come; will come
C．comes; comesD．will come; comes
D
I don’t know if my uncle  _______中含有 if引导的宾语从句，句意：我不知道我的叔叔是否回来，应该用一般将来时；If he _______ , I will be very happy中 if引导的是条件只状语从句，主句I will be very happy用一般将来时，从句要用一般现在时。所以选D.
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