Question

---_________ did you sleep last night?

---Only five hours．I stayed up late to do my homework．

1. A.
   How soon
2. B.
   How often
3. C.
   How long
4. D.
   How much

Answer 1

C
词义辨析。how long 指时间或长度，意为“多长”；how soon 指时间“多久，多快”，常用于将来时；how often指频率，“多久一次”；how much 指金钱“多少”。根据答语应为“多长”。