By the end of last year,they _____(learn) two thousand English words.
问题描述：
By the end of last year,they _____(learn) two thousand English words.
答
By the end of last year, they _____(learn) two thousand English words.
learned
答
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
答
过去的过去,had learnt.
答
have learned
答
had learned用过去完成时
答
had learned
答
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.
答
had learnt 过去完成时