By the end of last year,they _____(learn) two thousand English words.

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By the end of last year,they _____(learn) two thousand English words.
By the end of last year,they _____(learn) two thousand English words.

By the end of last year,they _____(learn) two thousand English words.
had learnt
或者 had learned
因为by the end of last year终止点是过去的时间,所以用过去完成时,至于learn过去分词的拼写,两种都可以.

have learned

had learned

had learnt 过去完成时

过去的过去,had learnt.

had learned用过去完成时

By the end of last year, they _____(learn) two thousand English words.
learned

had learnt 或者 had learned, by表示截止到...之前,在去年年底之前,他们就已经学了两千英语单词,学的动作发生在过去的过去所以用过去完成时,had+过去分词