The boys followed the marks that they ________, until finally they found their w
题型：不详难度：来源：
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 |
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答案
| C |
解析
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。 |
举一反三
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