—Did you visit the museum last week?
—No, we , but we spent too much time shopping.
A. could have
B. could
C. must have
D. must
网友回答
(答案→)A. could have
B. could
C. must have
D. must
解析：考查情态动词。--上个星期你们参观博物馆了吗？--没有，我们本可以去的。但是我们在购物上花了太多的时间。本可以做某事：could have done.