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

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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。

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