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We know that about seventy percent _____ the earth _____ covered by water.

A. /; is B. of; are

C. of; is D. about; are

 

C

【解析】

試題分析:句意:我們都知道70%的土地都被水覆蓋。百分數+名詞做主語,謂語動詞的選擇要根據這個名詞而定。本題中earth是不可數名詞,因此謂語動詞要用單數。故選C。

考點:考查主謂一致。

 

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