这题选A对么,若不对,怎么选,说明理由

题目

这题选A对么,若不对,怎么选,说明理由
29．Once ____ the forest,you ought to remain ____ you are waiting for help．
A．losing; where B．losing; there
C．lost; there D．lost; where

答案

不对,应该选D.完整的句子：Once （you are）lost in the forest,you ought to remain where you are waiting for help.因为主从句中主语相同省略从句中主语和be动词.在森林中迷路应该是be lost in the forest,而不是...