There was ______ time _____ Chinese used foreign oil.
A．a(chǎn); whenB．a(chǎn); whileC．/; whenD．/; while
：A
：考查冠詞和定語從句。本題的time是可數(shù)名詞：時(shí)期。所以第一空用a;第二空是定語從句，定語從句的結(jié)構(gòu)是很完整的，所以使用關(guān)系副詞。句意：曾經(jīng)有這樣一段時(shí)間，中國人用外國的汽油。故A正確。
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