It is reported that 40 percent of the land in Brazil________covered with trees.
A．isB．wasC．a(chǎn)reD．were
A
答案　A　[考查的是數(shù)量詞作主語(yǔ)時(shí)的主謂一致。句意：據(jù)報(bào)道，巴西百分之四十的土地都有森林覆蓋。40 percent修飾the land，the land表示“陸地”時(shí)是不可數(shù)名詞，謂語(yǔ)必須用單數(shù)；又因?yàn)橹骶渲^語(yǔ)動(dòng)詞是一般現(xiàn)在時(shí)，因此選A。]
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