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

问题补充：

—Who do you think will get the first prize?

—Mary, of course. She for the competition for months.

A. is preparing

B. was preparing

C. had been preparing

D. has been preparing

答案：

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。