题目内容：

The front door of the house______ ,so we had to enter through the back door.
A .being painted B having just been painted
C.to be painted D.was being painted

优质解答

答案是D.
因为后面的句子是一般过去时态,所以考虑句意：前门正在粉刷中,我们需要从后门进.所以是过去进行时态,而且是被动语态：was being painted.
如果该句中没有so,则应该选A.

追问：

再问一句 如果没有so B有没有问题

追答：

您好，在语法上是可以的，意思上也过得去，所以B也可以。