單項選擇題向一個棧頂指針為hs的鏈棧中插入一個s結(jié)點時,應(yīng)執(zhí)行()

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


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