I don't know if he __tomorrow.if he ___piease let me know.A.comes,comes B.will come,comes C.will come,will comewhy?
问题描述:
I don't know if he __tomorrow.if he ___piease let me know.
A.comes,comes B.will come,comes
C.will come,will come
why?
答
B
前者if在宾语从句中,后面句子的时态随前面的主句变
后者是if引导的条件状语从句,主句用将来时(祈使句除外),从句用现在时