用since、for或ago填空.1.We haven't seen Sally ( ) six months.

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• 用since、for或ago填空.1.We haven't seen Sally ( ) six months.
• 用since、for或ago填空.1.We haven't seen Sally ( ) six months.
• 用since、for或ago填空.1.Harry left this town in January and we haven't seen him.
• 用since、for或ago填空.1.Harry left this town in January and we haven't seen him.
• ten minutes before
• we guarantee to deliver the goods whithin fourteen days of on receipt of your order.这句里的介词为什么用on不用in呢 ,顺便翻译一下这句话的意思这里的on并不是用在具体某天前啊,,而且后面也不是接时间 他前面就是一个介词of，on后面是名词receipt，所以你们的回答根本不对路3楼的回答我明白了