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

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。
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