—Who do you think will get the first prize? —Mary, of course. She for the competition for

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A. is preparing
B. was preparing

(答案→)C. has been preparing
D. had been preparing
解析：考查时态。本题的关键在于后面的时间状语for months，该短语要和完成时或者完成进行时连用，强调动作从过去开始持续到现在。句意：—你认为谁会获得第一名？—当然是Mary。在这几个月里她一直都在为这次比赛做准备。故C正确。