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