问题补充：
You can hardly imagine the difficulty Mrs. Jones had up her children.
A. brought
B. to bring
C. bringing
D. to have brought
答案：
A. brought
B. to bring
(答案→)C. bringing
D. to have brought
解析：本题考查非谓语动词。have difficulty/ fun/trouble/a hard time...(in)是常用句型。Mrs Jones had是定语从句。
