I can't understand it,will you please _____ once more?

问题描述:

I can't understand it,will you please _____ once more?
A.explain that word B.repeat that word C.explain us that word D.explain that word for us为什么D不对
A和C有什么区别

因为句型是explain sth.to sb.
A用的句型是explain sth.
D应该用句型explain sth.to sb.
C这个句型没有.