问题
选择题
The students their pens when the teacher told them to stop writing.
A. turn down B. put down C. put off
答案
答案：B
题目分析： A. turn down调小，关小，调低，B. put down * * ，放下，贬低，停止，C. put off推迟，扔掉，阻止，stop doing sth.停止正在做的事儿，句意：当老师告诉学生们不要写了，他们都放下手中的笔。故选B。