______ he is a hard-working person, he has not been successful in business.

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问题 ______ he is a hard-working person, he has not been successful in business.

选项 A、Since
B、Although
C、Unless
D、However

答案B

解析 本题考查引导从句的连词的用法。since意为“自从……以来”,引导时间状语(从句);unless意为“如果不,除非……否则就……”,引导条件状语从句;however意为“无论……,然而”,后接形容词表程度或表示转折;although或though意为“尽管,虽然”,引导让步状语从句。
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