单选题Who do you think ___

问题补充：

单选题Whodoyouthink_____forthefailureoftheirmarriage?A.to blameB.to be blameC.is to blameD.is to be blamed

答案：

C解析do you think 为插入语，who is to blame是句中主干，to blame不定式作表语，用主动表被动。