Bob spends a lot of money on books________he is not rich．A.ifB.thoughC.whenD.because
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B解析分析：Bob spends a lot of money on books和he is not rich之间是转折关系，所以用though，句子可以转换成Bob is not rich，but he spends a lot of money on books．注意：though和but不能同时用(在中文里是说“虽然……但是……”)