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The boys followed the marks that they ________, until finally they found their way back to the campsite.
A.leftB.have leftC.had leftD.have been left
C

试题分析:考查时态:句意:男孩跟随着他们留下的记号,直到最后他们到了回到营地的路。Leave the marks是发生在follow the marks之前的,所以用过去完成时,选C。
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