英语语法时态的问题

题目

英语语法时态的问题
----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.have prepared B.have been preparing C.had prepared D.was preparing
求大神分析一下这道题的解题思路以及C,D为什么不对,

答案

以前老师总是说题目给你的话就一定是有用的.从第一句话分析,“how is your project?”中“is”是现在时,说明设计才开始的,同时后面“last Friday”上周五才开始,说明是想了解现在计划的进度.所以C中“had prepared”...