选D没错的.
by.截止到.
by the end of last year 截止到去年年底,就是说还没到去年年底,这本身就是一个过去式.
主句 he had learned about 1500 English words 发生在 the end of last year 之前,就是过去的过去,所以是过去完成时.
有by就不用before了
By the end of last year he______about 1500 English words.
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