He has made as much progress that as is admirable.
He has made as much progress as is admirable.
He has made as much progress
第二句省略了That就是像状语从句。
第三句省略了比较状语从句就像as much是个副词词组差不多地。
第一句为错句。
第二句正确。
第三句由于比较对象听话人已知,所以省略。如果听话人无从得知,就是错误了。
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