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

B

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(xù)性動詞；when當……時候，后跟的動詞通常是持續(xù)性動詞或非持續(xù)性動詞；因為在主句里的動作發(fā)生在過去，所以從句的動作也是發(fā)生在過去。根據(jù)句意故選B。
考點：考查動詞時態(tài)的用法。

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