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 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 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 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 the electric computer came into use?
电子计算机开始应用到现在已有多久了？
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