The radiation of uranium was then regarded as_____secret of_____nature.

A.a;the                 B.a;a             C.the;the        D.a;/

D


解析:

本題考查冠詞的基本用法，單數(shù)名詞表示泛指，用不定冠詞。nature 為不可數(shù)名詞，不用冠詞。

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