---Will you read me a story Mummy?- OK. You have one if you go to bed as soon as possi

问题补充：

---Will you read me a story, Mummy?

--- OK. You have one if you go to bed as soon as possible.

A. might

B. must

C. could

D. shall

答案：

A. might

B. must

C. could

(答案→)D. shall

解析：考查情态动词。shall用于第二、三人称的陈述句中，表示允诺、警告、决心、威胁、强制等。此处表示允诺。