主谓一致问题The children in this class each -- a new school bag. A

each作为形容词,修饰单数名词,接单数动词。作为代词,单独使用,接单数动词；放在复数名词和代词后作同位语,接复数动词。each of them后可接单数或复数动词。如：Each man carries his own bag。（修饰单数名词）各人背自己的包。We each have our own office。(作We的同位语)我们各有各的办公室。Each carries his own bag。(代词)各人背自己的包。Each of them are/is here。(代词)他们每个人都在这儿。本题中the children是复数,所以用have