分类：教育/科学-学习帮助
问题：Atlast,wefoundourselvesinapleasa? 
At last, we found ourselves in a pleasant park wh trees providing shade and ______ down to eat our picnic lunch. 　　A. sitting　　　　　　 B. having sat　　　　　 C. to sit　　　　　　D. satA和D有什么区别？我觉得A也行啊，请详细讲解
回答：D.
and是连词.并列两个谓语.and前的谓语是found.所以and后的谓语也要用一般过去时.with trees providing shade 做定语