I'm sure that they must have visited the place before帮忙翻译下.
问题描述:
I'm sure that they must have visited the place before帮忙翻译下.
答
我确定他们以前就曾经来着旅游过/拜访过。
答
我确定他们以前一定来参观过这里。
答
我肯定他们以前绝对去过那个地方。
答
我确定他们以前肯定来过这个地方
答
我能确信,他们以前一定来过这个地方.