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：考查非谓语动词。句中he had the plan作定语，这里考查短语have difficulty (in) doing sth.做某事有可能。句意：我想知道他执行这个计划有什么困难。故B正确。