单项选择题

New ways have been found to prevent the river ______.

A．not to be polluted
B．against polluting
C．from polluting
D．from being polluted
<上一题 目录 下一题>
热门 试题

单项选择题
The business of doctors is to prevent and ______. disease.
A．kill
B．cure
C．wound
D．injure
单项选择题
He failed his exam, ______ proved that he wasn't working hard enough.
A．what
B．of which
C．which
D．that
相关试题