对如下定义的循环单链表，`print_list` 函数横线处填写（）。class Node: def __init__ (self , data) : self.data = data self.next = None def create_list(value) : head = Node(value) head.next = head return head def insert_tail(head , value) : p = head while p.next != head: p = p.next node = Node(value) node.next = head p.next = node def print_list(head) : # 填空位置 while True: print(p.data , end=" ") p = p.next if p == head : break print()
A. if head is None: return p.next = head
B. if head is None: return p = head.next
C. if head is None: return p = head
D. if head.next is None: return p = head
正确答案：C
试卷来源：202512 CCF-GESP编程能力等级认证Python五级真题