【C15】
A．Therefore
B．Although
C．Consequently
D．On the other hand
请帮忙给出正确答案和分析，谢谢！
A．becauseB．althoughC．unlessD．so
【24】A．IfB．AlthoughC．WhereasD．Because
A．SinceB．AlthoughC．HoweverD．Only if
【C15】A．ifB．althoughC．whereasD．besides
【C4】A．whenB．althoughC．butD．while
【C19】A．ThereforeB．AlthoughC．SimilarlyD．Moreover
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