20.Most of the earth's surface _______by water.(  )
A.is coveredB.are coveredC..coverD.

分析 大部分的地球表面被水覆蓋著.

解答 正確答案:A.根據(jù)句意可知大部分的地球表面被水覆蓋著,其中主語surface和謂語cover是被動關(guān)系,且描述的是一般事實,則應(yīng)用一般現(xiàn)在時的被動語態(tài),即主語+is/am/are+done,且主語surface是單數(shù),故選擇A.

點評 本題考查被動語態(tài),根據(jù)主謂關(guān)系確定語態(tài),再根據(jù)題干判斷時態(tài)即可作出選擇.

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