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Which is correct? "at that time" or "in that time" Here is the example sentence:

In the summer in Beijing it is always hot, even during the Qing Dynasty. People in/at that time did not have air conditioning, so they...

closed as off-topic by Jason Bassford, marcellothearcane, Mari-Lou A, Edwin Ashworth, David Aug 31 at 18:55

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    Consider “of that time”. – Lawrence Aug 31 at 3:45
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    There is nothing ungrammatical about either. Many more prepositions could also be used. It's a matter of personal opinion. – Jason Bassford Aug 31 at 14:27
  • I wouldn't use either, I'd change the expression or rephrase it: 1. In those days 2. in that era, 3. during that era/period, 4. in the past 5. many centuries ago – Mari-Lou A Aug 31 at 16:36
  • I’d go for Peking. Certainly at that time that was the English. – David Aug 31 at 18:56
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Generally speaking, "at" is used to refer to a point in time, while "in" refers to the time period after the present moment.

  • I'll call you back at 5.30.
  • I'll call you back in 10 minutes.

If we apply the same logic to "that time", the following sentence seems coherent:

  • I'll be cooking pasta for the next twenty minutes; could you please lay the table in that time?

So, I would definitely use at that time in the example sentence, as it refers to a point of time, not to the period starting now.

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I read a lot and I want to say it is "at that time" because it sounds better and has more of a cadence melodic harmonious feel to it.

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