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 Theboysfollowedthemarksthatthey

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問題詳情:

 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

知識點:過去完成時及其被動式

題型:選擇題

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