问题补充:
He devoted himself to his research and got many achievements.
A. certainly
B. extremely
C. carefully
D. entirely
答案:
A. certainly
B. extremely
C. carefully
(答案→)D. entirely
解析:考查副词:A. certainly当然,B. extremely非常,C. carefully仔细地,D. entirely 完全地,句意:他完全致力于研究得到很多的成就。选D。