The old scientist devoted most of his time the space science.A. developB. to developingC

问题补充：

The old scientist devoted most of his time the space science.

A. develop

B. to developing

C. to develop

D. developing

答案：

A. develop

(答案→)B. to developing

C. to develop

D. developing

解析：考查固定搭配。devote ...to sth./doing sth.“致力于......”。句意“那个老科学家把大部分时间都用于研究空间科学上了。”to是介词，故用doing。故选B。