【题目】Their child is at the stage__________ she can say individual words but not full sentences.
A. whyB. where
C. whichD. what
在线课程【答案】B
【解析】
考查定语从句。句意：他们的孩子正处于能说单个单词而不能说完整句子的阶段。句中she can say individual words but not full sentences是一个定语从句，先行词是the stage，关系词在定语从句中作地点状语，用关系副词where，故选B。