Question

9. Father demanded that his son        as soon as possible. (quit)

父亲要求儿子尽早地戒烟。

Answer 1

9. ( should ) quit smoking考查虚拟语气的用法。demand引导的宾语从句中，动词要用(should) do。此夕卜，insist(坚持要求) ,suggest(建议) ,propose, order,demand, require, request等后的宾语从句中要用虚拟语气，从句谓语用(should) do的形式。