Mr. Black is rich, ________ he is not happy.
A．a(chǎn)ndB．orC．butD．不填
C

試題分析：句意:Black先生非常的富有，但是他不開心。and 和，而且，是一個(gè)并列連詞，表示承接；or 連詞，否則；but 連詞，但是，表示轉(zhuǎn)折。根據(jù)句意可知，這里應(yīng)該是轉(zhuǎn)折的關(guān)系，故選C。
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