armchair是可数名词,意思是“扶手椅”.表示“坐在扶手椅上”应用介词in.故答案为：
They are sitting in the armchair.
由于主语是They,所以他们不能坐在一把扶手椅上.如果改为为：They are sitting in the armchairs.会更好.
修改They are sitting on the armchair.这句话
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