题目内容

The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.

A. after
B. before
C. since
D. when

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Leave your key with a neighbor ___ you lock yourself out one day.

A. ever since
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A. before
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有7个队参加的团体比赛，如果采用单循环赛方式进行比赛，那么比赛需要打：

A. 6轮21场球。
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