they go to shanghai on their holiday改为过去式
问题描述：
they go to shanghai on their holiday改为过去式
答
They went to Shanghai on their holiday.
答
they went to shanghai ontheir holiday
答
They have been to shanghai on their holiday.
答
为什么to要加t ?
答
They went tot Shanghai on their holiday.
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答
they went to shanghai on their holiday.