How long is it since we last went to the theatre?
我们多久没去看戏了？
How long is it since you smoked?
你戒烟多久了？（或你多长时间没抽烟了？）
How long is it since I saw you last?
我上次见你到现在有多长时间了？
How long is it since you lived in Shanghai?
你离开(没住在)上海多久了？
How long is it since we visited your mother?
自从看了你母亲后有多长时间了？
How long is it since the electric computer came into use?
电子计算机开始应用到现在已有多久了？
How long is it since I shut myself in here? 'she asked, suddenly reviving.
“我把自己关在这儿有多久了？”她问，忽然精神恢复过来。
How long is it since I shut myself in here? 'she asked, suddenly reviving.
“我把自己关在这儿有多久了？”她问，忽然精神恢复过来。
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