They were___Australia___September 用at in on请填空,
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Theywere___Australia___September用atinon请填空,Theywere___Australia___September用atinon请填空,Theywere___Aus
They were___Australia___September 用at in on请填空,
They were___Australia___September 用at in on
请填空,
They were___Australia___September 用at in on请填空,
in （国家名称前用in)
in (月份名称前用in)
我认为都应该用in
分别用 in on
Australia 是国家，大地点，所以用 in
September ，九月，较长，用 on，年前用in，具体的日前用at
填in 和on