they ,their classmates were all in the classroom. A.Before; were arguing B.When; are arguing C.While; were arguing D.While; are arguing 答案:C 查看更多

 

题目列表(包括答案和解析)

_____they______, their classmates were all in the classroom.

A. Before; were arguing               B. When; are arguing

C. While; were arguing              D. While; are arguing

 

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