________ you understand the rule,you will have no further difficulty doing it.A.Though B.While C.Once D.Unless

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________youunderstandtherule,youwillhavenofurtherdifficultydoingit.A.ThoughB.WhileC.OnceD.Unless____

________ you understand the rule,you will have no further difficulty doing it.A.Though B.While C.Once D.Unless
________ you understand the rule,you will have no further difficulty doing it.
A.Though B.While C.Once D.Unless

________ you understand the rule,you will have no further difficulty doing it.A.Though B.While C.Once D.Unless
答案C 四个连词比较,此题用once引导假设状语从句,表示“一旦你理解了这一规则”.查看原帖>>