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

試題分析：考查時(shí)態(tài)：句意：男孩跟隨著他們留下的記號(hào)，直到最后他們到了回到營(yíng)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)，選C。
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