There was __ time _ Chinese used...

There was ______ time _____ Chinese used foreign oil.

A．a; when

B．a; while

C．/; when

D．/; while

：A 【解析】：考查冠词和定语从句。本题的time是可数名词：时期。所以第一空用a;第二空是定语从句，定语从句的结构是很完整的，所以使用关系副词。句意：曾经有这样一段时间，中国人用外国的汽油。故A正确。

考点分析：

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There was ______ time _____ Chinese used...