-----I wonder if you could go with me to the supermarket.
------- Don’t disturb me. I my experiment report all the morning and haven’t finished yet.
A. write
B. was writing
C. have written
D. have been writting
网友回答
A. write
B. was writing
C. have written
(答案→)D. have been writting
解析：表示动作从过去某一时间开始一直持续到现在，并且有可能持续下去，故用现在完成进行时。