What was he doing his father back?A. while; came B. when; came C. when; was coming 题目和参考答案——青夏教育精英家教网—

What was he doing ______ his father _______ back?
A. while; came B. when; came C. when; was coming

解析试题分析：句意:当他的父亲回来的时候，他正在做什么？while当……时候，后跟的动词通常是持续性动词；when当……时候，后跟的动词通常是持续性动词或非持续性动词；因为在主句里的动作发生在过去，所以从句的动作也是发生在过去。根据句意故选B。
考点：考查动词时态的用法。

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