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。