题目内容：

___ glad to help you.
A.Each of them are
B.They each are
C.They are each
D.Each are
很奇怪的一道题

优质解答

each of them算单数
eg.Each of them is here.
Each of them has been to the US.
不选A
each pron.(视作单数)各个;每个
不选D
复数主语与each连用时,应不受each的影响,谓语动词仍用复数形式
故选B