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。