单选题I really didn’t understan

问题补充：

单选题Ireallydidn’tunderstand____mademysonsosadthismorning.A.what was itB.what it was thatC.it was what thatD.what was it that

答案：

B解析考查强调句的特殊疑问句形式。强调句的特殊疑问句：What was it that made ….,但因为此句做understand后面的宾语从句，故用陈述语序。