问题补充:
—Hi, Susan, you look tired.
—I for months for the coming celebration of our school’s 90th anniversary.
A. was preparing
B. have been preparing
C. had prepared
D. prepare
答案:
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,你看起来很累。--我一直为即将到来的学校的90周年庆典做准备。说明这几个月一直在准备,而且一直到现在都很累,用现在完成进行时,选B。