问题补充:
-----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
答案:
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。