His physician told him not to take too much of the drug because it was very potent.

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问题 His physician told him not to take too much of the drug because it was very potent.

选项 A、bitter
B、irritant
C、effective
D、powerful

答案D

解析 句意:他的医生告诉他不要吃太多这种药,因为它药力太大。potent有力的,有效的。powerful强大的,有力的。bitter苦的;痛苦的。irritant刺激的。effective有效的。
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