i just wonder _ that makes him so excited.a\why it does b\what he does c\how it is d\what it isi just wonder _ that makes him so excited.a\why it doesb\what he doesc\how it isd\what it is我想知道原因 另外如果用B 应该怎么说~

i just wonder _ that makes him so excited.a\why it does b\what he does c\how it is d\what it isi just wonder _ that makes him so excited.a\why it doesb\what he doesc\how it isd\what it is我想知道原因 另外如果用B 应该怎么说~
i just wonder _ that makes him so excited.a\why it does b\what he does c\how it is d\what it is
i just wonder _ that makes him so excited.
a\why it does
b\what he does
c\how it is
d\what it is
我想知道原因
另外如果用B 应该怎么说~

i just wonder _ that makes him so excited.a\why it does b\what he does c\how it is d\what it isi just wonder _ that makes him so excited.a\why it doesb\what he doesc\how it isd\what it is我想知道原因 另外如果用B 应该怎么说~
首先,“使他如此兴奋”一定是一件事或物所以只可以是what.
其次,空格后面的部分是wonder的宾语从句.如果是b,宾语从句就成为：
what he does that makes him so excited.他所做的事就是what he does很明显多了that.而d,宾语从句成为：
what it is that makes him so excited.是What makes him so excited的强调主语的形式.