--------the age of twenty,he had written two books.A.At B.On

--------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~

蓝灵残天 1年前已收到3个回答举报

sdtyro 幼苗

共回答了23个问题采纳率：82.6% 举报

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

1年前

长度大于6 幼苗

共回答了1个问题举报

选C ，到20岁为止，他已经写了两本书。
by与完成时态连用。

1年前

莫敏儿99 幼苗

共回答了45个问题举报

C. By

1年前

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