by the end ofthe year all but two people------.A have left B

Dby the end of 通常表示将来 ,到……快结束/末尾的时候 by the end of +将来的时间,句子一般采用将来完成时 eg:i will have finished reading the book by the end of next month。by the end of 。。。意为:到。为止(常与完成时态连用注:不一定非要将来的完成不可,还可和过去完成时呀现在完成时连用) by the end of this year,they will have finished work on the new stadium(在今年年底工人们很把路铺好）注：have+过去分词表将来完成时