I wondered what difficulty he had the plan?
A. to carry out
B. carrying out
C. carried out
D. with carrying out
网友回答
A. to carry out
(答案→)B. carrying out
C. carried out
D. with carrying out
解析：本题考查非谓语动词。此处he had是定语从句，引导词代替difficulty做had的宾语，省略了。补充完整是he had that（difficulty）（in）carrying out…。