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______ you understand it, it’s easy for you to obey it.
A．As soon asB．OnceC．UnlessD．The moment
B
考查連詞。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。故選B。
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