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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
A

试题分析:考查状语从句的省略:句意:如果没有按照医生的说明吃药,它可能会有严重的副作用。这句话的原句是if the medicine is taken without following the doctor’s instructions,…..,如果主从句的主语一致,可以省略状语从句中的主语和be动词,选A。
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