CD Prep 08 一道题质疑！

xiaobaibai92112

In 1914 a total of469,000 cars and trucks were produced in the United States, but in 1929 almosttwice the numbers of trucks alone came off the assembly lines.

A.    the numbers of trucks alone

B.    that number of trucks alone

C.    the number of trucks by themselves

D.     as many trucksthemselves     

E.    as many trucks by themselves

正确答案为B。很纳闷，后半句不是应该是trucks came of lines吗？如果用B的话就变成twice that number came of the lines 了吗？？
求解！

lminj

这是比较句型 twice/double sth 是…的两倍