Mr Chen told us that three fourths of the earth ________covered with water.

A．wereB．isC．wasD．a(chǎn)re

B

解析試題分析：句意：陳老師告訴我們地球的四分之三都被水覆蓋著。賓語從句中的事實為客觀真理，所以時態(tài)用一般現(xiàn)在時，the earth做主語，后面的謂語動詞用單數(shù)形式，故選B。
考點：考查主謂一致和時態(tài)。

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