Sarah knew nothing about it her sister told her. A.if B. until C. since

发布时间:2020-08-22 15:51:19

Sarah knew nothing about it      her sister told her.
A. if                      B. until                    C. since

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解析:if如果,是否;until直到; since由于,自从。句意:直到她的妹妹告诉她,她什么都不知道。故选B。
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