单选题 —How often do his parents let him watch TV?
—______.
  • A. In two days
  • B. When he finishes his homework
  • C. Only once a week
  • D. In the evening


【正确答案】 C
【答案解析】How often…是频率疑问词，所以回答应是多长时间一次。Only once a week意为“一周只一次”。