19. I wonderedthat made him so upset.A. how it wasB. which did itC. what it wasD. who

问题补充：

19. I wonderedthat made him so upset.

A. how it was

B. which did it

C. what it was

D. who did it

答案：

A. how it was

B. which did it

(答案→)C. what it was

D. who did it

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