I just wonder that makes him so excited. A. why it doesB. what he doesC. how it isD. what

问题补充：

I just wonder that makes him so excited.

A. why it does

B. what he does

C. how it is

D. what it is

答案：

A. why it does

B. what he does

C. how it is

(答案→)D. what it is

解析：句意：我想知道是什么让他那么兴奋。由I wonder可以看出是现在时态，宾语从句中用陈述语序，故D项正确。