be doing … when suddenly啥意思?
be doing sth.when
用be+doing +when be
可不可以用be doing,when be doing?
be doing 意思
英语翻译2.I was doing some housework when suddenly the door bell
如何对be doing sth when造句
各举一个be+doing+while+be+doing和be+doing+when+did的例句,be最好为过去时
when suddenly 怎么用呢?
be getting used to doing的意思
关於should be doing的意思
I was having a nap when suddenly the telephone rang的意思?
suddenly 的音标,意思