He felt the pain again when the effect of the drug______.

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问题 He felt the pain again when the effect of the drug______.

选项 A、wore on
B、wore down
C、wore out
D、wore off

答案D

解析句意：药效减弱后他再次感觉到疼痛。wear off消失，减弱。wear on(时间)慢慢过去。wear down磨损，损耗。wear out穿破；疲劳。

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医学博士外语

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