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Bad habits, ______ formed(形成), are difficult to give up.
A.andB.onceC.forD.but
B

试题分析:考查状语从句的省略式,英语中如果主从句的主语一致,可以省略从句的主语和be动词,once formed=once bad habits are formed句意:坏习惯,一旦形成,就很难戒掉。选B。
点评:做这种题目可以用还原法做题,先把主语和be动词加上,再判断是主动还是被动。句意通顺才行。
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