【正确答案】 C

【答案解析】原文：M: Mom, may I work at the zoo?W: Work? Where?M: We have a chance to work at the zoo for the whole holiday. All my classmates are going. Can I? Please?W: Sounds interesting.M: Does that mean you are letting me go?W: Yes. But how about a favor from you in return when breakfast is over? Go and practice cleaning cages by starting with that cage you call a bedroom!