how long___ you ____this pen?A have had B did buy回答是 ----only one day.可是回答里的时间没有for引导

Question

how long___ you ____this pen?A have had B did buy
回答是 ----only one day.
可是回答里的时间没有for引导

Answer 1

问题补充：
回答是 ----only one day.
可是回答里的时间没有for引导
当然可以没有for
你拥有这只钢笔多久了?
我给的例子是完整的回答:
I have had this pen for ten years.
我已经拥有它十年了.
你可以简单回答成:十年了(for) ten years
加不加for 都行.
A have had
你拥有这只钢笔多久了?
因为有段时间,how long
I have had this pen for ten years.
是I have this pen的完成时.
buy是点动词,不能跟段时间.
可以说成:when did you buy this pen
Ten years ago.