题目内容：

When he was still a child,He used _____ many question,some of which others could not answer.
A.to asking B.to ask C.asking D.as

优质解答

B,used to do 表示过去常常做某事,而现在往往不做了i used to get up early in the morning when i was still a hight school student.be used to doing 表示习惯于做某事i am used to eating rice now.be used to d...