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

______ 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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