问题补充:
I really didn’t understand made my son so sad this morning.
A. what was it
B. what it was that
C. it was what that
D. what was it that
答案:
A. what was it
(答案→)B. what it was that
C. it was what that
D. what was it that
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。