问题补充:
(·北京高考)When we saw the road with snow, we decided to spend the holiday at home.
A. block
B. to block
C. blocking
D. blocked
答案:
A. block
B. to block
C. blocking
(答案→)D. blocked
解析:选D考查非谓语动词。句意:当我们看到道路被雪封住后,我们决定在家过假期。分析句子结构可知,此处是“see+宾语+宾语补足语”结构。宾语补足语是do形式时,表示“看见宾语做某事的全过程”;宾语补足语是doing形式时,表示“看见宾语正在做某事”;若宾语补足语与宾语是动宾关系时,则用过去分词形式作宾语补足语。road与block之间是被动关系,故选D。