_____we met with difficulties,he came to help us 是填no matter when还是whenever

问题描述:

_____we met with difficulties,he came to help us 是填no matter when还是whenever

一般可以用no matter when的时候都可以用whenever,所以考试的时候选whenever的时候多些
no matter when不能引导主语从句和宾语从句
这里都可以用