问题
选择题
Our playground is not so tidy and beautiful as before. Students must _____ dirty things on it.
A．be stopped to throw
B．be stopped from throwing
C．stop to throw
D．stop from throwing
答案
答案：B
题目分析：句意：我们的操场不不以前那样干净漂亮了。同学们必须停止在操场乱扔脏东西。stop sb. from doing sth. 也是阻止某人做某事的意思must be done 必须停止做某事。故选B