[题目]I don’t know .A. when he will come back B. when will he come backC. when he comes back D. when he does come back 题目和参考答案——青夏教育精英家教网—

【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

【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。

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