—Hi, Susan, you look tired.
—I for months for the ing celebration for the school’s 60th anniversary.
A. was preparing
B. have been preparing
C. had prepared
D. prepare
网友回答
A. was preparing
(答案→)B. have been preparing
C. had prepared
D. prepare
解析：考查时态。句意：—你好。Susan，你看上去很累。—几个月来我一直在准备60周年校庆的事情。根据句意指这几个月我一直在做某事，所以使用现在完成进行时。故B正确。