people have always been curious ______ how living things on the earth exactly began.
A．inB．a(chǎn)tC．ofD．a(chǎn)bout
D
介詞辨析。句意：人們總是對(duì)地球上的生物如何確切的出現(xiàn)的很好奇。選D，關(guān)于，表示好奇的對(duì)象。
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