Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.(1分)-湖北继续教育网网校

[单选题]Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.(1分)

Abefore

Bonce

Cuntil

Dunless

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试题答案：

B

答案解释：

解题思路：句意：坏习惯一旦形成，很难有时是不可能去掉的了。Before……以前；once一旦；until直到……才；unless除非。这里once后跟从句，从句是省略句，完整的是once they are formed，根据句意故选B。

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