I don’t know when __________.A.will the train leave B.the train will leave C.would the train leave D.the train leave

问题描述:

I don’t know when __________.
A.will the train leave B.the train will leave C.would the train leave D.the train leave

答案:B.该题考查的是宾语从句的语序和时态.只有B在语序和时态上符合要求.