There was once a cruel king __ in the castleA.livedB.who livesC.was livingD.living

问题描述:

There was once a cruel king __ in the castle
A.lived
B.who lives
C.was living
D.living

D
A.lived:错,缺少主语
B.who lives:错,时态不对
C.was living:错,缺少主语
D.living;正确选择

选D,
应该是主动,所以排除A
如果用定语从句的话谓语应该是过去式,所以排除B C的话,肯定不能选,缺了成分