There are lots of English books here,and ______ of them is easy to understand A all B each

题目

There are lots of English books here,and ______ of them is easy to understand A all B each

答案

There are lots of English books here,and ______ of them is easy to understand A all B each
选B
因为后面的谓语动词是is,所以用each
用all的话,谓语动词是用复数的