In some restaurants,food and service are worse than _____ used to be.a.they b.it c.them d.that
问题描述：
In some restaurants,food and service are worse than _____ used to be.a.they b.it c.them d.that
A.they B.it C.them D.that
还有为什么
答
A they
代替food and service ,复数概念为什么不选that我不是说了吗， 这个不是代替单个的东西， 而是代替food and service ， 和主句的主语一样，是复数概念， 而that 是单数