Generally speaking, when _____ according to the directions, the medicine has no side effect.
A．takenB．takingC．to takeD．to be taken
A

試題分析：考查狀語從句的省略：句意：“通常說來，當(dāng)被按照說明書服用時，這個要沒有副作用�！睉�(yīng)為這句話的主語是drug，所以應(yīng)該是“被服用”，所以是when +過去分詞。省略了the medicine is，選A。
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