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【题目】__________ you form a bad habit, it’s very difficult to get rid of it.

A.OnceB.AsC.WhileD.Where

【答案】A

【解析】

考查连接词。句意:一旦你养成了一个坏习惯,就很难改掉。A. Once一……就……;B. As当……时候;因为;C. While当……时候;D. Where哪里。根据句意可知本句为时间状语从句,表示“一……就……”。故选A

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