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
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.