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boththehostandhostessareseatingwiththeguests中seating要改成seated才正确,为什么不能用seating而非要用seated呢?

题目详情
both the host and hostess are seating with the guests中seating要改成seated才正确,为什么不能用seating而非要用seated呢?
▼优质解答
答案和解析
be seated 是固定语法.
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