问题补充:
There was a big dog in front of Mr. Hill’s house, so David didn’t dare to go near it.
A. to sit
B. sat
C. sitting
D. sits
答案:
A. to sit
B. sat
(答案→)C. sitting
D. sits
解析:考查现在分词做定语,There was a big dog是个完整的句子,后面应该是定语修饰dog,dog和sit是主动关系,用现在分词做定语,句意:有一只狗坐在希尔先生家门口,所以大卫不敢走近。选C。