--------the age of twenty,he had written two books.A.At B.On C.By D.from其中该选哪个呢?要说明理由哦~

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--------theageoftwenty,hehadwrittentwobooks.A.AtB.OnC.ByD.from其中该选哪个呢?要说明理由哦~--------theageoftwenty,

--------the age of twenty,he had written two books.A.At B.On C.By D.from其中该选哪个呢?要说明理由哦~
--------the age of twenty,he had written two books.A.At B.On C.By D.from
其中该选哪个呢?
要说明理由哦~

--------the age of twenty,he had written two books.A.At B.On C.By D.from其中该选哪个呢?要说明理由哦~
C.By
by the age of 截止...岁；到……年龄时
这个时间状语一般用于过去完成时,后半句had written ,所以选C

C. By

选C ，到20岁为止，他已经写了两本书。
by与完成时态连用。

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