你的问题不太清楚,如果是 the number of people remained unchanged.这样的句子太多了。指人的数量不变。你如果想问people who + remained unchanged,也就是说人做主语,能不能接remained unchanged, 这要看上下文了,比较少见,但也有。如:
Stephen Acabado debunks theory that the people of Ifugao remained unchanged for 2,000 years
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