My mind wasn't on what he was saying so I'm afraid I ___half of it .

问题描述:

My mind wasn't on what he was saying so I'm afraid I ___half of it .
为什么不填had missed而填missed
不是过去完成吗?

因为missed是与wasn't同时发生的(不专心的同时错过了……),动作没有先后