精选优质文档-倾情为你奉上持续性动词与非持续性动词：练习：1.When he arrived at the bus stop, the bus _ for 20 minutes.A. has left B. had left C. has been away D. had been away2.I _ the League for 5 years so far.A. joined B. have joined C. have been in3.The factory _ since the February of 1988.A. has been open B. has opened C. was open D. opened4.Mary and Rose _friends since they met in 2000.A. have made B. have been C. made D. have become5.You mustnt _
