Though ______, many laws of nature exist.

A. not having been discovered B. having not been discovered

C. not having discovered D. having not discovered

 

A

【解析】句意：盡管沒有被發(fā)現(xiàn)，但是許多自然規(guī)律是存在的。連詞加現(xiàn)在分詞短語作狀語；此句等于：Though the laws of nature have not been discovered

 

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