I just wonder that makes him so excited.
A. why it does
B. what it does
C. how it is
D. what it is
网友回答
A. why it does
B. what it does
C. how it is
(答案→)D. what it is
解析：句意：我就是想知道究竟是什么使得他如此激动。强调句的特殊疑问句式是“特殊疑问词 + is/was + it that,这里含有一个宾语从句，故用陈述语序，选D。