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I just wonder that makes him so excited. [ ] A.why it does B.what he does C.how

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I just wonder that makes him so excited. [ ] A.why it does B.what he does C.how

I just wonder ________ that makes him so excited.

[]

A.why it does

B.what he does

C.how it is

D.what it is

试题答案

答案:D