问题补充：
The food in the fridge bad. Throw it away, please.
A. is smelt terrible
B. smells terrible
C. smells terribly
D. is smelt terribly
答案：
A. is smelt terrible
B. smells terrible
(答案→)C. smells terribly
D. is smelt terribly
解析：smell 是系动词，表示“闻起来怎么样”，后跟形容词，bad表示糟糕。
