I wonder that made him so upset yesterday.A. it was whatB. what is itC. what it wasD. it

问题补充：

I wonder that made him so upset yesterday.

A. it was what

B. what is it

C. what it was

D. it what is

答案：

A. it was what

B. what is it

(答案→)C. what it was

D. it what is

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