问题
选择题
I wondered what difficulty he had _____ the plan.
A．to carry out
B．carrying out
C．carried out
D．with carrying out
答案
答案：B
题目分析：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。