Question

I know him ______ a good football player while in college. A．to have been B．to be C．was D

I know him ______ a good football player while in college. A．to have been B．to be C．was D．had been

Answer 1

A

考查时态。句意“我知道她在大学时是一个出色的足球运动员。”know和be有先后关系，故用完成时。故选A。