At last we found ourselves in a pleasant park trees providing shade(荫凉)and sat down to eat

问题补充：

At last，we found ourselves in a pleasant park trees providing shade(荫凉)and sat down to eat our picnic lunch．

A. for

B. from

C. of

D. with

答案：

A. for

B. from

C. of

(答案→)D. with

解析：考查with的复合结构作定语。最后我们在有树荫的宜人的公园里坐下来吃午餐。