don't know _________ he will come tomorrow. _________ he comes, I'll tell you．
A. if; Whether B. whether; Whether C. if; That D. if; If
为什么ABC都不行,解释第一空 if; Whether 都行是引导的宾语从句,第二空只能If 是引导的条件状语从句
I want to know _________.
A. whom is she looking afterB. whom she is looking
C. whom is she lookingD. whom she is looking after
为什么D不行呢?是不是句末不能加介词?解释答案就是D. whom she is looking after