新新prep2-222

scholar

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

B. that number of trucks alone  麻烦解释一下

C. the number of trucks by themselves

D. as many trucks themselves

E. as many trucks by themselves    

scholar

答案是B