【题目】We can never imagine the trouble Mrs. Black had ______ her daughter.
A. to have brought up B. to bring up
C. bringing up D. brought up
在线课程【答案】C
【解析】
试题分析：句意：我们想象不出来Mrs. Black在养育女儿过程中遇到的困难。have trouble in doing sth.“做某事有困难”，此处省略了in，动词用doing，故选C.