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 Theboysfollowedthemarksthatthey

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问题详情:

 Theboysfollowedthemarksthatthey

 The boys followed the marks that they ________, until finally they found their way back to the campsite.

  A. left            B. have left     C. had left         D. have been left

【回答】

C

知识点:过去完成时及其被动式

题型:选择题

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