a moment ago是刚才的意思
改为they were doing some shopping a moment ago.
变成过去进行时,表示过去某个时刻正在进行的动作或状态：他们刚才正在购物.
was\were后是否加动词ing
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a moment ago是刚才的意思
改为they were doing some shopping a moment ago.
变成过去进行时,表示过去某个时刻正在进行的动作或状态：他们刚才正在购物.