问题补充：
All of her time was devoted to her homework, so she had no time to have fun.
A. do
B. doing
C. does
D. done
答案：
A. do
(答案→)B. doing
C. does
D. done
解析：考查固定搭配。固定搭配be devoted to sth/doing sth致力于做某事；这里的to是介词，故后面使用动名词的形式。句意：她所以的时间都花在了做家庭作业上了，所以她没有时间去玩。故B正确。
