---May! How is your plan? I heard you started it last Sunday.---Oh! I for it but I haven’

问题补充：

---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

答案：

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。