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Three­fourthsofthesurfaceoftheearth

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問題詳情:

Three­fourthsofthesurfaceoftheearth

Three­fourths of the surface of the earth________covered by water.

A.is               B.are                              C.were                 D.has been

【回答】

知識點:一般現在時及其被動式

題型:選擇題