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3句英文任你选
For how long does your offer remain open?
报价有效期多长?
We will keep our offer open/valid/firm/effective/good for one week.
我们报价有效期为一周。
Our offers are for three days.
我们的报盘三天有效。
半个句型要记牢
For how long -(多长)
Tip:
How long用来提问某动作或状态发生的时间长短，与延续性动词连用，对表示"一段时间"的短语 (three days , half an hour, for 20 minutes等)提问时用，后面如有介词for，应将介词for提前。
