—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
C. had been preparing
(答案→)D. has been preparing
解析：考查时态，本题的关键词是时间状语for months;该短语做时间状语的时候，经常和现在进行时或者现在完成进行时连用。句意：—你认为谁会赢得第一名？—也许是Mary，这几个月她一直都在准备。现在完成进行时表示从过去某个时间到现在一直进行的动作，故D正确。