Question

—I ______ for you for two hours, but in vain. Where did you go?                           
—I ______ at my uncle’s.

A．had looked; may have stayed	B．looked; must have stayed
C．have looked; may be staying	D．looked; must be staying

Answer 1

B

本题考查时态。根据句意可知“我寻找你两个小时”是过去发生的事情，故用一般过去时；must have done表示过去一定做某事。故选B。