But for the survival instinct which nearly all creatures have,______(更多的物种就可能已经在地球上灭绝了)

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问题 But for the survival instinct which nearly all creatures have,______(更多的物种就可能已经在地球上灭绝了)

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答案more species would have been extinct from the earth

解析 but for“要不是,如果没有”后应使用虚拟语气。主句谓语用“would+have done”的形式。“更多的物种”用more species表达。“可能已经灭绝了”翻译为would have been extinct。“在某个地方灭绝”用be extinct from表达。
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