The manager devotes all his spare time the violin.
A. to practise
B. to practicing
C. in practising
D. for practising
网友回答
A. to practise
B. to practicing
C. in practising
D. for practising
解析：考查词组：devote all one’s time to doing全部时间都花在…上，句意：经理所有时间都花在练习钢琴上面。选B。