you know the rules of swimming, you will be able to swim well. A.Before B.While C.Though D.Once 题目和参考答案——青夏教育精英家教网—

题目内容

___ you know the rules of swimming, you will be able to swim well.

A.Before B.While C.Though D.Once

解析:

连词Once引起条件状语从句，本句意思是:一旦你了解游泳的规则,你就会能游得很好了。

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