Seeing the road with snow they had to stay at home watching TV and drinking coffee.A. b

问题补充：

Seeing the road with snow, they had to stay at home, watching TV and drinking coffee.

A. blocking

B. blocked

C. to block

D. to be blocked

答案：

A. blocking

(答案→)B. blocked

C. to block

D. to be blocked

解析：考查非谓语动词。句意：看到公路被大雪堵住了，他们不得不呆在家，看电视喝咖啡。过去分词作补足语表示被动的动作，和被修饰词是动宾关系。结合语境可知选B。