There Was an oil painting__ in the corner.It __ there for several days.A.laying,had laid B.lai

题目

There Was an oil painting__ in the corner.It __ there for several days.A.laying,had laid B.lai
要解析
题目完全的是这样
There Was an oil painting____ in the corner.It _____ there for several days.
A.laying,had laid B.lain,had laid
C.lying,had lain D.laid,had been lain
为什么是lay？而不是其他的

答案

前空相当于an oil painting was laying there.
由于背景是过去时,所以后空用过完