They have been to Tiannamen Square 改为一般疑问句

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They have been to Tiannamen Square 改为一般疑问句

Have they been to Tiannamen Square

Have they been to Tiannamen Square?

Have they been to Tiannamen Square? (主语和have互换位置即可)

Have they must been to Tiannamen Square?
不太确定,好长时间没接触了