问题标题:
Badhabits,_______formed,aredifficult,andsometimesimpossibletoshakeoff.()A.onceB.beforeC.untilD.unless
问题描述:
Bad habits,_______ formed,are difficult,and sometimes impossible to shake off.()
A.once
B.before
C.until
D.unless
蔡新霞回答:
答案:A
题干中Bad habitsare difficult,and sometimes impossible to shake off是一个简单句,中间插入了一个动词formed;formed形成,与badhabits之间构成被动关系,相当于badhabitsareformed;要填连词,说明是一个省略句;句意表示的是条件;once一旦,before在之前,until直到,unless除非.故选A.
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