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已知头指针h 指向一个带头结点的非空单循环链表，结点结构为
其中next是指向直接后继结点的指针，p 是尾指针，q 是临时指针。现要删除该链表的第一个元素，正确的语句序列是( )
A. h -> next = h -> next -> next; q = h-> next; free(q);
B. q = h -> next; h -> next = h -> next -> next; free(q);
C. q = h-> next; h -> next = q -> next; if(p != q)p = h; free(q);
D. q = h-> next; h -> next = q-> next; if(p == q)p = h; free(q);
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参考答案：D
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