I____ asleep because it took me a long time to realize that the telephone was ringing.

A．could have fallen

B．should have fallen

C．must have fallen

D．mustn’t have fallen

金融约束理论认为，金融市场失灵本质上是（）。

A.政府调控失误

B.金融监管过度

C.信息失灵

D.金融制度不健全