___ you know the rules of swimming, you will be able to swim well. A．BeforeB．Whi
题型：不详难度：来源：
___ you know the rules of swimming, you will be able to swim well. | A．Before | B．While | C．Though | D．Once |
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答案
| D |
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。 |
举一反三
It looks ___ it is going to rain.| A．like | B．as | C．as if | D．even if |
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___ happens, we’ll carry on the experiment.| A．Wherever | B．Whatever | C．Whenever | D．Whoever |
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| Use your head,___ you’ll find a good way. |
___, he was a man known to the people all over the town.| A．Tailor as he is | B．A tailor as he is | | C．Tailor as is he | D．A tailor as is he |
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___ ,she is experienced.| A．As she is young | B．Young as is she | | C．Young as she is | D．Though she was young |
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