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引導(dǎo)的賓語從句，句意：我不知道我的叔叔是否回來，應(yīng)該用一般將來時(shí)；If he _______ , I will be very happy中 if引導(dǎo)的是條件只狀語從句，主句I will be very happy用一般將來時(shí)，從句要用一般現(xiàn)在時(shí)。所以選D.
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