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【题目】You should inspect the wheels regularly, and replace them ______ they cause you trouble.

A. while B. when C. before D. Until

【答案】 C

【解析】

试题分析:考查连词辨析。A当时;然而;B在....时候,随着;C在之前;D直到才;句意:你应该在出事之前经常检查车轮并及时更换。故选C。

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