Bad habits, ______ formed(形成), are difficult to give up.A．andB．onceC．forD．but
题型：不详难度：来源：
| Bad habits, ______ formed(形成), are difficult to give up. |
答案
| B |
解析
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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