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19.As students,____ we have made full use of our time to study,there's still room for improvement.(  )
A.howB.whichC.whileD.as

分析 作为学生,尽管我们充分利用时间学习,仍有充足的改进空间.

解答 答案:C.根据选项while当…时,尽管,然而(前后对比),再结合句意,作为学生,尽管我们充分利用时间学习,仍有充足的改进空间.可知此处缺少了一个引导让步状语从句的连接词,故C正确

点评 本题考查让步状语从句的连接词,在充分分析句型再结合语义的基础上便能选出正确答案,同时要注意其他选项的意思

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