现有Python定义的单向链表节点类如下，给定链表1->2->3->4（头节点head指向值为1的节点），若要删除值为2的节点，以下代码逻辑错误的是？

wr820600 单选题共个子题

class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

cur = head
while cur.next:
    if cur.next.val == 2:
        cur.next = cur.next.next
        break
    cur = cur.next

cur = head.next
pre = head
while cur:
    if cur.val == 2:
        pre.next = cur.next
        break
    pre = cur
    cur = cur.next

dummy = ListNode(0, head)
cur = dummy
while cur.next:
    if cur.next.val == 2:
        cur.next = cur.next.next
        break
    cur = cur.next

cur = head
while cur:
    if cur.val == 2:
        cur = cur.next
        break
    cur = cur.next

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