问题
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
答案
答案：D
固定词组。Prevent sb (from) doing sth阻止某人做某事；句意：新的方法已经被发现来阻止河流被污染。
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