單項選擇題

已知一個不帶頭結(jié)點單鏈表的頭指針為L,則在表頭元素之前插入一個新結(jié)點*s的語句為:()

A. L=s; s->next=L;
B. s->next=L; L=s;
C. s=L; s->next=L;
D. s->next=L; s=L;

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