Question

It's four o'clock now．We________the Science Museum this afternoon．Now we are going home．

1. A.
   visited
2. B.
   were visiting
3. C.
   have visited
4. D.
   will visit

Answer 1

C
分析：It'sfour o'clock now．表示说话时间在this afternoon的范围之内。Now we are going home．不仅表示“我们就要回家”(在使用be going to do结构时，如果动词是go或come就直接用go或come的进行时)，而且暗示了“参观已经结束”，用现在完成时，表示对说话时的现在有影响，我们“就要回家了。”