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There are some warnings in some countries ______ over exploitation of underground water has caused the decline of wetland and increase of desertification.
A．whichB．whereC．whatD．that
D

試題分析：考查同位語從句：句意：在一些國家有很多警告，過分的開采地下水已經導致濕地的減少和沙漠化的增加。這里橫線后面是同位語，說明warnings的內容，因為同位語從句的成分和意思都是完整的，用that連接，that不做成分，只起到連接的作用，但是也不能省略，which哪個，where哪里，what什么，不符合句意，選D。
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