单选题 It took him a lot of imagination to come up with such an ______ plan, a man with less intelligence wouldn't have done so.
【正确答案】 D
【答案解析】(ingenious有独创性的)。句意为：他用丰富的想象力提出了这样一个独创性的计划，没有多少智力的人很难做到这一点。A．artful狡猾的；B．inevitable不可避免的；C．optimistic乐观的。