He was unable to make such progress, __________________.A.as he tried hardB.as hard he triedC.so hard did he tryD.hard as he tried
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D解析试题分析：考查as引导的倒装句。当as放在名词，形容词，副词的后面，句子使用倒装句。本题hard as he tried=Though he tried hard.尽管他很努力了。。。。考点：考查as引导的倒装句
点评：本题重在掌握as“尽管”时可引起倒装，同时although引导让步状语从句时不能倒装，as引导让步状语从句时必须倒装，而though引导让步状语从句时可以倒装也可以不倒装。