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I wondered what difficulty he had _____ the plan.
A.to carry outB.carrying outC.carried outD.with carrying out
B

试题分析: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。
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