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Thenaughtyboywassittingatthedesk,

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问题详情:

Thenaughtyboywassittingatthedesk,

The naughty boy was sitting at the desk, ______ hard when the teacher came into the classroom.

  ended to study                   ending to be studying

  ending to study                  ended to be studying

【回答】

B

知识点:非谓语动词

题型:选择题

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