Tom, clean up the broken glass someone walks on it.A.sinceB.whenC.beforeD.as
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Tom, clean up the broken glass _________ someone walks on it.
| A.since | B.when | C.before | D.as |
试题答案
C
解析试题

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