题目
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______ birds use their feathers for flight,some of their feathers are for other purposes.( )
A. Once
B. If
C. Although
D. Because
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解答一
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答案C.
once"一旦",引导条件状语从句.if"如果",引导条件状语从句.although"尽管,虽然",引导让步状语从句.because"因为",引导原因状语从句.分析可知前后两句话之间是逻辑上的"让步"关系,再结合句子所表达的意思可知答案选C.
once"一旦",引导条件状语从句.if"如果",引导条件状语从句.although"尽管,虽然",引导让步状语从句.because"因为",引导原因状语从句.分析可知前后两句话之间是逻辑上的"让步"关系,再结合句子所表达的意思可知答案选C.
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