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
网友回答
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。