弦图证明勾股定理:Do you know when it __?A,built B,was built C,has been built

Do you know when it __?A,built B,was built C,has been built -DO you know when the lecure on the present situation-----? Do you know when Thanksgiving is的意思 Do you know when their plane leave Beijing?改错 When you know when you know when you know Do you know? Do you know? Do you know 邵菁?