—I’m sure Andrew will win the first prize in the final. —I think so. He for it for months

问题补充：

—I’m sure Andrew will win the first prize in the final.

—I think so. He for it 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：

D。根据句中的…will win the first prize in the final可知，决赛还没有举行，所以下文谈到的“准备”指的肯定是从过去一直持续到现在的情况，故用现在完成进行时。