---Do you often stay up?---No. I always get a good night’s sleep much work I have to do.A

问题补充：

---Do you often stay up?

---No. I always get a good night’s sleep much work I have to do.

A. whenever

B. however

C. whatever

D. whichever

答案：

A. whenever

(答案→)B. however

C. whatever

D. whichever

解析：考查让步状语从句。句意：无论我有多少作业要做，我晚上总有一个很好的睡眠。How much 多少，故选B。