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It takes 80 years for Mediterranean Water _________ Atlantic water.

[  ]

A. to change
B. changed
C. change
D. to be changed

答案:D
提示:

如果不定式的逻辑主语是不定式所表示动作的承受者,不定式要用被动式即to be done句意:地中海的水需要80年才能同大西洋的水交换一次.


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