问题
选择题
___ you know the rules of swimming, you will be able to swim well.
A．Before
B．While
C．Though
D．Once
答案
答案：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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___ you know the rules of swimming, you will be able to swim well.
A．Before
B．While
C．Though
D．Once
答案：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。