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

試題分析：句意:當(dāng)他的父親回來的時(shí)候，他正在做什么？while當(dāng)……時(shí)候，后跟的動詞通常是持續(xù)性動詞；when當(dāng)……時(shí)候，后跟的動詞通常是持續(xù)性動詞或非持續(xù)性動詞；因?yàn)樵谥骶淅锏膭幼靼l(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。
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