I was chatting on the Internet last night when I smelt somethingin the next roomA. burnin

问题补充：

I was chatting on the Internet last night when I smelt somethingin the next room．

A. burning

B. to burn

C. be burnt

D. to be burnt

答案：

(答案→)A. burning

B. to burn

C. be burnt

D. to be burnt

解析：

这题考查现在分词做宾语补足语的用法：smell +宾语+现在分词，“闻到某物正在…”，something和burn是主动关系，选A。句意是：昨晚我在网上聊天，这是闻到隔壁房间什么东西在烧。选A。