The boys followed the marks that they ________, until finally they found their way back to the camps...
2022-12-02 18:06:46 26次 2013-2014学年湖南省高三月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
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
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