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 题目和参考答案——青夏教育精英家教网—

题目内容

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

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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C．have been working; have	D．am working; will have

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