He devoted himself to his research work, having no time to play.
A. exactly
B. gratefully
Cloosely
D. entirely
网友回答
A. exactly
B. gratefully
C. loosely
(答案→)D. entirely
解析：考查副词辨析：A. exactly确切地，B. gratefully感激地C. loosely松散地，D. entirely完全地，句意是：他全身心的投入到研究工作中，没时间玩。选D。