—How was your trip to Yancheng last week?
—Wonderful! I only felt sorry that I the nature reserve of redcrowned cranes, but the weather was awful.
A. could visit
B. could have visited
C. might visit
D. might have visited
网友回答
A. could visit
(答案→)B. could have visited
C. might visit
D. might have visited
解析：答案：B 考查虚拟语气。句意为：你上周去盐城的旅游怎么样？相当不错！要不是天气糟糕的话，我本可以去参观丹顶鹤自然保护区的。那是我唯一感到遗憾的事情。本题为含蓄式虚拟语气的表达，其中but引导的句子相当于if条件句。根据语意可知，此处是对过去情况的假设虚拟，因此主句中的谓语动词应用“should/could/would＋have done”的形式。故答案选B。