A study published in the magazine Science suggests that 58% of the world's land surface_ below the biodiversity level_ safe for the health and happiness of human societies already.（　　）

A．reduced has considered

B．reduced has been considered

C．has reduced considered

D．has been reduced considered

【考点】现在完成时．

【答案】D

【解答】

【点评】

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发布：2024/5/27 14:0:0组卷：2引用：1难度：0.6

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A study published in the magazine Science suggests that 58% of the world's land surface___________ below the biodiversity level___________ safe for the health and happiness of human societies already.（ ）