---May! How is your plan? I heard you started it last Sunday.
---Oh! I for it, but I haven’t decided where to start it.
A. have prepared
B. had prepared
C. have been preparing
D. was preparing
网友回答
A. have prepared
B. had prepared
(答案→)C. have been preparing
D. was preparing
解析：考察时态.句意:梅！你的计划怎么样了？我听说你上周开始了。——哦，我一直在准备，但是我还没有决定从哪儿开始。可知准备工作在此之前一直在进行，故用完成进行时态，选C。