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______ you understand it, it’s easy for you to obey it.
A.As soon asB.OnceC.UnlessD.The moment
B
考查连词。As soon as一……就;Once一次,一旦;Unless 除非;The moment立刻,一……就。句意:一旦你明白了,你就容易遵守它。故选B。
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