Tom, clean up the broken glass _________ someone walks on it.A．sinceB．whenC．befo
题型：不详难度：来源：
Tom, clean up the broken glass _________ someone walks on it.| A．since | B．when | C．before | D．as |
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答案
| 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。 |
举一反三
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