--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. shall
D. could
网友回答
A. might
B. must
(答案→)C. shall
D. could
解析：考查情态动词特殊含义。Might也许；must必须，一定；偏偏；shall表示允诺，强制，命令；could能够；句意：—妈妈，你能给我读一个故事吗？—如果你能尽可能快地上床睡觉，我就读给你听。本句中的shall表示的是“允诺”；故C正确。