Question

【题目】I don’t know ______.

A. when he will come back B. when will he come back

C. when he comes back D. when he does come back

Answer 1

【答案】A

【解析】句意：我不知道他将什么时候回来。when he will come back是when引导的宾语从句，陈述语序；when will he come back形式错误，在宾语从句中应使用陈述语序；when he comes back中用的是一般现在时态，但根据句意这个宾语从句表示的是将来的动作，应用一般将来时态；when he does come back形式错误，does是助动词，构成否定句或疑问句，而这里是肯定句。故应选A。