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?jǐn)?shù)+名詞做主語(yǔ)，謂語(yǔ)動(dòng)詞的選擇要根據(jù)這個(gè)名詞而定。本題中earth是不可數(shù)名詞，因此謂語(yǔ)動(dòng)詞要用單數(shù)。故選C。

考點(diǎn)：考查主謂一致。

 

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