“What’s going on there?” “Sorry I don’t know what ”A. is the matterB. is matterC. a matt

问题补充：

“What’s going on there?” “Sorry, I don’t know what ”

A. is the matter

B. is matter

C. a matter is

D. matter is

答案：

(答案→)A. is the matter

B. is matter

C. a matter is

D. matter is

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