By the end of last year he______about 1500 English words.

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By the end of last year he______about 1500 English words.

By the end of last year he______about 1500 English words.
By the end of last year he______about 1500 English words.

By the end of last year he______about 1500 English words.
had learnt
By the end of 是用过去完成时的标志