----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
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解析：考查时态。现在完成进行时表示过去发生的事情持续到现在，而且还正在进行；通常都与all the time, all the morning等连用；句意：—我敢确定Andrew会赢得决赛。—我也这样认为。他这几个月来一直都在准备这场比赛。表示这段时间一直都在发生的事情。故D正确。