—Bob! How’s your project? I heard you started it last Friday, right?
—Oh! I for it. But I haven’t decided when to do it.
A. had prepared
B. was preparing
C. have been preparing
D. have prepared
网友回答
A. had prepared
B. was preparing
(答案→)C. have been preparing
D. have prepared
解析：表示动作从过去某一时间开始一直持续到现在，并有可能持续下去，故用现在完成进行时。