【题目】It was not until the teacher told them the answer ______ the students understood what the question really meant.
A．before B．that C．then D．when
在线课程【答案】B
【解析】句意：直到这位老师告诉他们答案，学生们才开始理解这个问题真正意味着什么。本题考查not...until的强调句结构：It be not until +被强调部分+that...，故选B项