The doctor informed his patient that the drug was very______and can have unpleasant side effects.

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问题 The doctor informed his patient that the drug was very______and can have unpleasant side effects.

选项 A、potent
B、efficient
C、intricate
D、fragile

答案A

解析各项的意思是：potent(药等)效力大的；强有力的；efficient有能力的；效率高的；intricate错综复杂的；fragile易碎的；虚弱的。根据句意判断，答案是A。

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