Thescientisthashadaresearch       weatherformorethan30y...

問題詳情：

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，意為“對某事（物）進行研究”，故*為B。

知識點：介詞和介詞短語

題型：選擇題