Jim has been like this ever since this morning.改为提问句．___ ___(两个空) has Jim been like this?不会的不要乱答.
问题描述：
Jim has been like this ever since this morning.
改为提问句．
___ ___(两个空) has Jim been like this?
不会的不要乱答.
答
how long
答
How long
大部分有since的,对时间段的提问都用How long