单选题For years an acrimonious debate over how to protect heroin users impeded efforts in the U.S. to control the spread of AIDS.A
convoluted B
belied C
stoked D
encumbered
题目内容(请给出正确答案)
单选题
For years an acrimonious debate over how to protect heroin users impeded efforts in the U.S. to control the spread of AIDS.
