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【题目】— Why does the earth look blue in space?
— Because most of the earth's surface by water.
A.covers
B.is covered
C.cover
D.are covered

【答案】B
【解析】考查动词的语态。句意:-为什么在太空中,地球看上去是蓝色的?-因为地球的大部分地方被水覆盖着。句子的主语是surface是谓语动词cover的承受者,句子用被动语态,most ofthe earth’s surface表示单数含义,谓语动词用单数。故选B。

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