微机系统正常运行时，其主程序采用（）方式进行，直到有中断申请为止。

A、定时运行

B、人工设定

C、无限循环

D、运行一次

His colleagues ______ him though he himself didn’t think he had done anything special.

A．thought highly of

B．looked up to

C．sing high praise of

D．show great respect for