2.I don't know _________ the day after tomorrow.

问题描述:

2.I don't know _________ the day after tomorrow.
A.when does he come B.how will he come
C.if he comes D.whether he'll come
为什么不是c

D 不是c的原因是时态不对.应该为if he will comes. if这里解释为是否,完全可以用将来时