Once _______ in the forest, we should remain ________ we are and wait for help.

Once _______ in the forest, we should remain ________ we are and wait for help.
A. losing; there B. losing; where C. lost; there D. lost; where
【答案】D
【解析】
【详解】考查状语从句的省略和名词性从句。句意：一旦在森林里迷路了，我们就应该待在原地，等待救援。Once _______ in the forest是一个条件状语从句，从句主语和主句主语相同，且含有be动词，所以从句主语连同be动词可以一起省略。be lost in在……中迷路，是固定用法。remain是系动词，后接表语从句，从句中缺少地点状语，所以用连接副词where。故选D。