The boy __English on the radio when I __ his door.A.was learning,opened B.is learning ,opened

问题描述:

The boy __English on the radio when I __ his door.A.was learning,opened B.is learning ,opened
我觉得两个都可以,究竟改选哪个呀?

A 两个讲的都是过去的事才对啊