[問題]GWD12-Q4

[iamdior]

B
Q14:
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

請問為何選B
C錯在哪呢 ?

謝謝

[micht]

this question is very simliar to this one..

http://www.formosamba.com/phpBB3/viewtopic.php?t=2260