Seeing the road with snow and cyclists falling down here and there we decided to walk to

问题补充：

Seeing the road with snow and cyclists falling down here and there, we decided to walk to our office.

A. to block

B. blocking

C. blocked

D. to be blocked

答案：

A. to block

B. blocking

(答案→)C. blocked

D. to be blocked

解析：句意：看见路上有雪堵着，还有一些骑自行车的人的在路上东倒西歪的，我们决定走着去我们的公司。seeing the road blocked with snow and cyclists falling down here and there,在句中作状语。这里see sth done短语，the road 与block之间是被动关系，故选C。