问题
选择题
He devoted himself _______ to his research and got many achievements.
A．certainly
B．extremely
C．carefully
D．entirely
答案
答案：D
题目分析：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。