题目内容：

--Can you tell me________?----Certainly .In half an hour.
A:when will the train leave B:when the train will leave
C:when the train to leave D:when the train leaves

优质解答

答案肯定是B.我们不看can you tell me,看后面横线上的句子,很明显,B是符合语法的,而且,回答中用的是in half an hour.我们可以知道这是表示将来,所以前面用将来时