Tom, clean up the broken glass someone walks on it.A. sinceB. whenC. beforeD. as

发布时间：2020-08-17 05:47:24

Tom, clean up the broken glass      someone walks on it.
A. since
B. when
C. before
D. as

网友回答

A. since
B. when
(答案→)C. before
D. as
解析：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。
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