ask a quesiton

yaoxiayi

In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost twice the numbers of tucks alone came off the assembly lines.

A.the numbers of tucks alone
B.that number of trucks alone
C.the number of trucks by themselves
D.as many trucks themselves
E.as many trucks by themselves

The key is B, but I chose C. Why?

切尔西

A和B应该是单复数的问题，这里只是指卡车，而且那个数是指代前面出现的数，所以需要用单数

海洋之心1988

怎么不划线····

vincent815

搭个车，A为什么不行？