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(yǔ)從句中的事實(shí)為客觀真理，所以時(shí)態(tài)用一般現(xiàn)在時(shí)，the earth做主語(yǔ)，后面的謂語(yǔ)動(dòng)詞用單數(shù)形式，故選B。
考點(diǎn)：考查主謂一致和時(shí)態(tài)。

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