Despite their lack of success so far, research scientists have ______ in their r

游客2023-10-27 39

问题 Despite their lack of success so far, research scientists have ______ in their research for a cure for AIDS.

选项 A、maintained
B、retained
C、insisted
D、persevered

答案 D

解析四个选项都有“坚持”或“保持”之意，句首的Despite引导让步状语从句，可知其后的主句应表“科学家们坚持研究”，且该词还必须能与in搭配，故D正确。maintain是及物动词，表示“维持，继续”；retain也是及物动词，表示“保持，保留”；insist表示“坚持，强调”，与on搭配使用。

转载请注明原文地址:https://www.tihaiku.com/zcyy/3133540.html

相关试题推荐

随机试题

最新回复(0)

(1)RemembertheStoneAgedaysofresearchbackinelementaryschoolandmidd