单选题
Lucy knew nothing about it ______ her sister told her.
A、
[A] because
B、
[B] until
C、
[C] since
【正确答案】
B
【答案解析】
[精解] 句子意思是直到姐姐告诉她，Lucy对此事一无所知。because、since放在这里意思都不对。
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