问题描述：
He is so good a student that he always does his exercise as ______ he can.A.careful so B.care
He is so good a student that he always does hisexercise as ______ he can.
A.careful so B.careful as C.more carefully D.carefully as
He is so good a student that he always does hisexercise as ______ he can.
A.careful so B.careful as C.more carefully D.carefully as
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