【題目】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

【答案】C

【解析】

試題分析：C；考查時(shí)態(tài)。過去完成指發(fā)生在過去之前，也就是過去的過去的動作。句意：男孩跟隨著他們留下的記號，直到最后他們到了回到營地的路。Leave the marks是發(fā)生在follow the marks之前的，所以用過去完成時(shí)，故選C。

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