题目内容：

Today is Susan's birthday .Among those ____ are some old friends of mine .
A.inviting B.invitations C.to invite D.invited
为什么选D,请详解,

优质解答

把整句完善为：Today is Susan's birthday,Among those who are invited are some old friends of mine.
此时,作为主语补足语修饰those,invited可以仅用被动时态进行修饰,从而省去 who are,避免出现重复累赘.
B意思是 请帖,不对