One third of this area (cover)______with trees,50 percent of which are pines.is

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问题 One third of this area (cover)______with trees,50 percent of which are pines.

选项

答案 is covered

解析句意：这个地区的1/3被树木覆盖，其中的50%是松树。该题考查的是被动语态。作谓语用动词，从句意看用被动态。

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