问题
选择题
(2013·苏南四校3月联考)Everybody knows about it now! But no one knows ________ once prevented the rumor from spreading.
A．what was it that
B．what it was that
C．how it was that
D．why it was that
答案
答案：B
句意：现在大家都知道它了。但没人知道是什么曾经阻止了谣言传播。根据句意并分析句子成分可知，第二句为主从复合句，宾语从句是一个强调句，被强调的部分是主语，故用what。宾语从句中的语序应用陈述语序，故答案为B。