【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】句意：你應(yīng)該在出事之前經(jīng)常檢查車輪并及時更換。A.while”當(dāng).....時，然而”；B. when“在.......時候，隨著”；C.before 在......之前“；D. until”直到.....才“。故選C。

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