Question

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

Answer 1

D

试题分析：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。