问题
选择题
The river smells terrible. People must_____ dirty things into it.
A．be prevented to throw
B．prevent from throwing
C．prevent to throw
D．be prevented from throwing
答案
答案：D
题目分析：句意：这条河太难闻了。必须阻止人们朝里面倾倒垃圾。Prevent sb from doing sth意为“阻止某人做某事”；根据句意可知应该是人们被阻止去做某事，B项缺少宾语；故选D。