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

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

A.maintained

B.retained

C.insisted

D.persevered

请帮忙给出正确答案和分析,谢谢!

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  • 正确答案:D
    动词词义与搭配题。四个选项都有“坚持”或“保持”之义,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。