Smith kept hi business from getting smaller ,_____he was not able to expand it in hte financial crisis.A.although B.since C.while D.whether

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Smith kept hi business from getting smaller ,_____he was not able to expand it in hte financial crisis.
A.although B.since C.while D.whether

正确答案:A.although
因为:一二句是承接关系(Smith保持生意不萎缩,尽管他不能在经济危机时期做大.)
b.since 因果(Smith保持生意不萎缩,因为他不能在经济危机时期做大)不通
c.while转折(Smith保持生意不萎缩,然而他不能在经济危机时期做大)不通
D.whether假设 (Smith保持生意不萎缩,如果他不能在经济危机时期做大)不通