分类：教育/科学-外语学习-英语考试
问题：Iwas______worklastweek,butIchang? 
I was ______ work last week, but I chang my mind.a. to start   b. to have started    c. to be starting    d. to have been starting
回答：B   这句话的意思是：我上一周本来要去工作的，但是最后我改变主意了。
have  done  sth  ————本来要做某事而未做