So far, a large number of forests________because of air pollution and water pollution.

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问题 So far, a large number of forests________because of air pollution and water pollution.

选项 A、has been destroyed
B、destroy
C、have destroyed
D、have been destroyed

答案D

解析 “a number of+复数名词/代词”作主语时,后面的谓语动词应用复数形式;而“the number of+复数名词/代词”作主语时,后面的谓语动词应用单数形式。本句的主语为a large number of forests,所以谓语动词应用复数形式。根据句意和句中的时间状语so far(到目前为止)可知,本句应用现在完成时,表示过去的某一动作或行为一直持续到现在,而且还有可能延续下去。又因为a large number of forests和destroy(破坏)之间是逻辑上的动宾关系,所以应用被动语态。故选D。
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