2. 专升本
  3. _____you understand this rule, you’ have no further difficulty.

_____you understand this rule, you’ have no further difficulty.

admin2012-08-05  62
问题 _____you understand this rule, you’  have no further difficulty.
选项 A、Once
B、Unless
C、As
D、Until
答案A
解析 once引导的让步状语从句，意为“一旦”。句意为“一旦明白了这条规则，就再也没有困难了"。
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