He devoted himself to his research and got many achievements.A. entirelyB. extremelyC. ca

问题补充：

He devoted himself to his research and got many achievements.

A. entirely

B. extremely

C. carefully

D. certainly

答案：

(答案→)A. entirely

B. extremely

C. carefully

D. certainly

解析：考查副词：A. entirely 完整的，B. extremely非常的，C. carefully仔细的，D. certainly当然，句意是：他完全投入研究，并取得了很多成就。选A。