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

【考點】現在完成時．

【答案】D

【解答】

【點評】

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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.（ ）