单链表中,指针 p 指向的结点的后继为 q 指向的结点,在指针为 p 的结点之后、 q 之前插入指针为 s 的结点,正确的操作是:( )。
A.
p->next=s; s=p
B.
p=s;p=q
C.
p=q;s=p
D.
s->next=q; p->next=s
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