Question

【题目】I don't know when __________.
A.will the train leave
B.the train will leave
C.would the train leave
D.the train leave

Answer 1

【答案】B
【解析】句意：我不知道火车什么时候离开。宾语从句保持陈述语序，即：引导词+主语+谓语。AC是疑问语序，可排除；D的谓语动词不对，应该是leaves或者will leave，故排除。因此选B。