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 Everystudentlistenedtotheirteachercarefully,

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问题详情:

 Everystudentlistenedtotheirteachercarefully,

 Every student listened to their teacher carefully, ________their eyes on the blackboard.

  A. kept                  B. having kept      C. to keep          D. keeping

【回答】

D

知识点:非谓语动词

题型:选择题

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