The doctor informed his patient that the drug was very____and can have unpleasant sideeffects.

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问题 The doctor informed his patient that the drug was very____and can have unpleasant sideeffects.

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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