【題目】he 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

【答案】C

【解析】句意:男孩們沿著他們之前留下的腳印直到他們找到回到營(yíng)地的道路。根據(jù)句意可知他們留下腳印是之前完成的事情,故使用過(guò)去完成時(shí)。故C正確。

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