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

解析試題分析：句意:當他的父親回來的時候，他正在做什么？while當……時候，后跟的動詞通常是持續性動詞；when當……時候，后跟的動詞通常是持續性動詞或非持續性動詞；因為在主句里的動作發生在過去，所以從句的動作也是發生在過去。根據句意故選B。
考點：考查動詞時態的用法。

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