Though______, many laws of nature exist.
A、
not having been discovered
B、
having not been discovered
C、
not having discovered
D、
having not discovered
【正确答案】
A
【答案解析】
解析：本题考查分词短语作状语。此句为连词加现在分词短语作状语，等于：Though the laws of nature have not been discovered，many laws of nature exist。
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