在一个尾指针为rear的不带头结点的单循环链表中,插入一个s所指的结点,并作为第一个结点，可执行（）。

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【单选题】【消耗次数：1】

① A．rear?next= s; s?next=rear?next

② B．rear?next=s?next;

③ C．rear=s?next

④ D．s?next=rear?next ; rear?next=s;

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