One quarter of the area ______ by green trees.

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问题 One quarter of the area ______ by green trees.

选项 A、are covered
B、is covered
C、covers
D、covering

答案B

解析 分数+of+the作主语时,谓语的单复数由of后面的名词决定;此句很容易看出应用被动语态,意为“1/4的地区为绿树所覆盖”。
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