Question

【题目】 You’d better find out ________.

A. when the train leave B. when does the train leave

C. when did the train leave D. when the train leaves

Answer 1

【答案】D

【解析】

试题分析：句意：你最好弄清楚火车什么时候开。宾语从句的语序是陈述句语序，the train是第三人称单数，谓语用leave的第三人称单数形式leaves。故选D。