Helen _____ a report on the state of the traffic last week but i don't know wheter or not she has finished it
问题描述：
Helen _____ a report on the state of the traffic last week but i don't know wheter or not she has finished it
A.wrote
B.had written
C.would wrote
D.was writting
选哪个?为什么?
答
D.was writting
“but i don't know wheter or not she has finished it”由此可见,“last week ”的时候是还没有“finish”的,所以选D,“上星期在写”.其他3个都不对.C.would wrote是过去将来时,其余两个都表示动作已经完成了.