For years an acrimonious debate over how to protect heroin users has impeded efforts in the U.S. to control the spread of AIDS.

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问题 For years an acrimonious debate over how to protect heroin users has impeded efforts in the U.S. to control the spread of AIDS.

选项 A、convoluted
B、belied
C、stoked
D、encumbered

答案D

解析 句意:几年来关于如何保护海洛因吸食者的激烈辩论阻碍了美国为控制艾滋病传播而付出的努力。impede(阻止);encumber(阻碍);convolute(旋绕);belie(掩饰);stoke(添燃料)。
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