When drive-ins were at the height of their popularity in the late 1950s, some 4,000 existed in the United States, but today there are less than one-quarter that many 有个选项是. the number is less than one-quarter the amount 想问下牛人,这里的one-quarter到底是什么词性呢? 单从语法看,只看这个选项这句话the number is less than one-quarter the amount。这种表达语法正确吗? 以前遇到过twice,有twice+n. , twice+ what从句,这里的twice又是什么词性呢? 这种问题好纠结啊!