more than 和 as many as

dkswoah

When drive-ins were at the height of their popularity in the late 1950's, some 4,000 existed in the United States, but today there are less than one-quarter that many.
Bthere are less than one-quarter that many.
there are fewer than one-quarter as many
there are fewer than one-quarter of that amount
the number is less than one-quarter the amount
it is less than one-quarter of that amount
这题选第二个  不是说 more than 和 as many as不能 一起用的么？
虽然 ACDE 主谓不一致 单复数修饰有问题  还是想问问  为什么B  对  是排除得到的么？   

brfmzbjz

1.谁说的more than 不能和as many as 一起用？给一下出处，大家好verify
2.as many的用法(摘自Longman):
as many=a number that is equal to another number 表示同样的数字
They say the people of Los Angeles speak 12 languages and teach just as many in the schools.
in as many days/weeks/games etc.
A great trip! We visited five countries in as many days (=in five days).
   *: "twice as many", "one-quarter as many", etc.都是非常常见的用法，记住这样的表达。