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The group’s research has done much to      our knowledge of the HIV virus.
A.advance B.pullC.rushD.adopt
A
动词辨析。A推进,增加;B拉;C突袭;D收养,采用;句意:那一群研究人员已经做了很多事情来增加我们在艾滋病毒方面的知识。故A正确。
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