不稳定型心绞痛在临床上可分为（）
A.极低危
B.低危组
C.极高危
D.高危组
E.中危组
参考答案：B, D, E
经人民法院裁定认可的和解协议，对债务人和全体债权人均有约束力。( )
--- What ____ have happened to Kevin?
--- He might have run into some trouble.
A．could
B．must
C．would
D．might
