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
--------the age of twenty,he had written two books.A.At B.On C.By D.from
--------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~
其中该选哪个呢?
要说明理由哦~
英语人气：842 ℃时间：2020-05-01 15:39:01
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