--- Oh,dear,I smell something ------.\x0b 

--- Oh,dear,I smell something ______.
--- God,my fish.
A.burn B.burned C.burning D.to burn
选C
首先,smell是连系动词,后跟形容词做表语.通常用动词的ing 形式.
句型是:[+v-ing][+(that)][+wh-]例如:
1.He smelled trouble.
他察觉到会有麻烦.
2.I smelled something burning.
我闻到东西烧焦的味道