—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. has been preparing

D. had been preparing

答案：

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。