(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
网友回答
A. what was it that
(答案→)B. what it was that
C. how it was that
D. why it was that
解析：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。