2. 外语
  3. New ways have been found to prevent the river______.

New ways have been found to prevent the river______.

admin2013-01-03  44
问题 New ways have been found to prevent the river______.
选项 A、not to be polluted
B、against polluting
C、from polluting
D、from being polluted
答案D
解析 prevent sth．from being…防止……被……。注意要用被动，因为“the rivet being polluted”。
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