【題目】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】

試題分析：考查連詞辨析。A當(dāng)…時(shí)；然而；B在....時(shí)候，隨著；C在…之前；D直到…才；句意：你應(yīng)該在出事之前經(jīng)常檢查車輪并及時(shí)更換。故選C。

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