although he is rich,---he is unhappyA or B / C yet D BorC

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althoughheisrich,---heisunhappyAorB/CyetDBorCalthoughheisrich,---heisunhappyAorB/CyetDBorCalthoughhe

although he is rich,---he is unhappyA or B / C yet D BorC
although he is rich,---he is unhappy
A or B / C yet D BorC

although he is rich,---he is unhappyA or B / C yet D BorC
D,although可以和yet,still连用.但绝对不能和but连用