It__you that __to blame.A.is;is B.is;are C.are;are D.are;is

问题描述:

It__you that __to blame.A.is;is B.is;are C.are;are D.are;is

选B.it是主语,所以第一个空用is.you时强调句的主语,所以用are.
这是it is...that...d的强调句型、