He devoted himself to his research work having no time to play.A. exactlyB. gratefullyC.

问题补充：

He devoted himself to his research work, having no time to play.

A. exactly

B. gratefully

Cloosely

D. entirely

答案：

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。