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式：句意：如果不安醫(yī)生的指導吃這個藥，這個藥可能有嚴重的副作用。當主從句的主語一致的時候，可以省略從句的主語和be動詞，if taken="if" the medicine is taken。選A。
點評：狀語從句和主句的主語一致的話，可以省略從句的主語和be動詞，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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