Once in the forest, you ought to remain you are waiting for help．
A. losing; where
B. losing; there
C. lost; there
D. lost; where
网友回答
A. losing; where
B. losing; there
C. lost; there
(答案→)D. lost; where
解析：考察固定词组和状语从句。Be lost in在…中迷路；第一空我们可以认为是省略句，省略了you are.第二空是一个状语从句，你应该呆在你等待帮助的地方。