单项选择题

在单链表中在指针p所指结点后插入结点q的操作是

A.q:=p↑.link; p↑.link:=q↑.link
B.p↑.link:=q↑.link; q↑.link:=p↑.link
C.q↑.link:=p; p↑.link:=q
D.q↑.link:=p↑.link; p↑.link:=q