一经确定为心跳停止，紧急处理必须争取在几分钟内重建氧化血循环（）。
A.1分钟
B.6分钟
C.9分钟
D.3分半钟
E.12分钟
参考答案：D
They demanded that the books ______ to the school library right away.[ ]
A. should return
B. be returned
C. were returned
D. returned
肝掌
