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There was ______ time _____ Chinese used foreign oil.

A./; whenB.a; whileC.a; whenD./; while

C

解析试题分析:句意:有一段时间中国人使用外国的油。there was a time 历史上有一段时期。time 后接定语从句用关系副词when作连接词在从句中作时间状语。故选C。
考点:考查冠词和连接词的用法。

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