高考題!過(guò)去完成時(shí)與過(guò)去式~
有具體時(shí)間和地點(diǎn)時(shí)用過(guò)去式,可是第二題中有“for three years”,看到"for+時(shí)間"都是用的完成時(shí),可是這也是具體時(shí)間,怎么區(qū)分?
題一：--Have you been to the United States?
--Yes,only once.I ___ there for seven years.
A.have stayed B.was staying C.stayed D.had stayed
題二：Susan ____ for three years to be a computer analyst but found her progress discouraging.
A.has worked B.worked C.had worked D.was working