单选题I received his mother’s&n

问题补充：

单选题Ireceivedhismother’stelephonecallateleven.＿＿thathewasbadlyhurtinanaccidentyesterday.A.Then did I knowB.Only then I knewC.Only then did I knowD.Only then knew I

答案：

C解析only修饰句子的状语（副词、介词短语、状语从句）位于句首时，句子的主谓部分倒装。