D
首先,never没有加to do的说法,所以排除A,B
never是个副词,后加过去完成时,一般现在时和现在完成时等都是看上下文的.
句意是“每一年消失的植物和动物的数量都在增加,没有看到它们的原因是污染和过度捕猎.”
前句明显是现在完成的时态,因为是和现在有关的,这种状况是一直持续的,所以我选D.个人观点啦~
Every year an increasing number of plants and animals are di
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