Recently people have made great progress in using ______ power of nature to produce ______ electricity.
A．a(chǎn); theB．/ ; /C．the; /D．a(chǎn); an
C.
解析：考查冠詞。第一個(gè)空特指自然界的power，所以用定冠詞；第二個(gè)空后的electricity是不可數(shù)名詞，所以不用冠詞。
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