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

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

admin2019-06-25  67
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://kaotiyun.com/show/jRRK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)