The group’s research has done much toour knowledge of the HIV virusA. advance B. pullC. r

问题补充：

The group’s research has done much toour knowledge of the HIV virus．

A. advance

B. pull

C. rush

D. adopt

答案：

(答案→)A. advance

B. pull

C. rush

D. adopt

解析：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。