单项选择题

Not having been discovered，many laws of nature actually exist in nature.

A．人们还没有发现自然当中存在许多法则。
B．还没有被发现，许多自然的法则实际上存在于自然当中。
C．自然中存在许多规律，这一点，还没有被人发现。
D．虽然还没有被人类发现，但是，许多自然规律实际上存在于自然当中。
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