题目内容

Our playground is not so tidy and beautiful as before. Students must _____ dirty things on it.
A.be stopped to throwB.be stopped from throwing
C.stop to throwD.stop from throwing
B

试题分析: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
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