第1个回答 2015-04-26
how long,how soon和how often都含有how,并且都和“多长时间、多久”有关,但它们的用法不相同。
how long意为“多久、多长时间”,主要是对一段时间进行提问,答语通常是(for)three days/weeks/months等时间段,它可用于各种时态。
How long do you stay in Beijing every year? 每年你在北京住多久?
How long have they lived here? 他们住在这里有多久了?
—How long were you not at school last year? 去年你多久没上学?
—About two weeks. 约两周本回答被提问者和网友采纳