you know the rules of swimming, you will be able to swim well. A. BeforeB. WhileC. Though

发布时间：2020-08-17 12:30:53

     you know the rules of swimming, you will be able to swim well.
A. Before
B. While
C. Though
D. Once

网友回答

A. Before
B. While
C. Though
(答案→)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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