You should inspect the wheels regularly, and replace them ______ they cause you trouble.
A．whileB．a(chǎn)sC．beforeD．until
C

試題分析：考查連詞辨析。A當(dāng)…時(shí)；然而；B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C正確。
點(diǎn)評(píng)：連詞before的用法是考查的重點(diǎn)內(nèi)容，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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