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(1/3)下面这道题应选择哪个答案、为什么?(_)of this area (_)covered with green trees and gr

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(1/3)下面这道题应选择哪个答案、为什么?(_)of this area (_)covered with green trees and gr
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答案和解析
One third of this area is covered with forest.题不完整,理同此句.第一空填(百)分数,或three- fourths,或75 percent,主语是this area,后一空定为is.