Thescientisthashadaresearch       weatherformorethan30y...

问题详情：

The scientist has had a research        weather for more than 30 years.

   A. in              B. on              C. at                               D. from

【回答】

 B    考查固定搭配。have a research on sth.是固定搭配，意为“对某事（物）进行研究”，故*为B。

知识点：介词和介词短语

题型：选择题