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Tom, clean up the broken glass _________ someone walks on it.

A.sinceB.whenC.beforeD.as

C

解析试题分析:考查连词:A.since自从,既然,B. when当…时候,C. before在…前面,D. as 正如,因为,虽然,句意:汤姆,在有人踩在上面之前把破碎的玻璃打扫干净。选C。
考点:考查连词

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