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If _____ without following the doctor’s instructions, the medicine may have serious side effects.

A.takenB.to be takenC.takingD.being taken

解析试题分析:考查状语从句的省略式:句意:如果不安医生的指导吃这个药,这个药可能有严重的副作用。当主从句的主语一致的时候,可以省略从句的主语和be动词,if taken="if" the medicine is taken。选A。
考点:考查从句的省略式
点评:状语从句和主句的主语一致的话,可以省略从句的主语和be动词,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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