【題目】Do you know about 70 per cent of our earth _____ water?

A. is covering with B. are covered with

C. are covering with D. is covered with

【答案】D

【解析】句意：你知道我們的地球大約70%被水覆蓋著嗎？be covered with“覆蓋著……”，主語(yǔ)about 70 per cent of our earth是不可數(shù)名詞，故謂語(yǔ)用第三人稱單數(shù)，故選D。

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