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

試題分析：考查狀語從句的省略式，英語中如果主從句的主語一致，可以省略從句的主語和be動詞，once formed＝once bad habits are formed句意：壞習慣，一旦形成，就很難戒掉。選B。
點評：做這種題目可以用還原法做題，先把主語和be動詞加上，再判斷是主動還是被動。句意通順才行。
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