If _____ without following the doctor’s instructions, the medicine may have serious side effects.
A．TakenB．to be takenC．TakingD．being taken
A

試題分析：考查狀語從句的省略：句意：如果沒有按照醫(yī)生的說明吃藥，它可能會(huì)有嚴(yán)重的副作用。這句話的原句是if the medicine is taken without following the doctor’s instructions，…..，如果主從句的主語一致，可以省略狀語從句中的主語和be動(dòng)詞，選A。
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