【題目】One-fifth of the area ________ covered with trees. About seventy percent of the trees ________ been planted recently.

A.is; hasB.are; haveC.is; haveD.are; has

【答案】C

【解析】

考查主謂一致。句意:三分之一的地區(qū)被綠樹(shù)覆蓋。已經(jīng)種植了大約百分之七十的樹(shù)木。當(dāng)主語(yǔ)被分?jǐn)?shù)或百分?jǐn)?shù)修飾時(shí),謂語(yǔ)和后面的名詞一致。故選C。

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