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.
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錯因為the number of X, 而不是the numbers of X. C的by themselves有點像說trucks come off the assembly lines by themselves... B的that number是指469000...B比較make sense. In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost twice that number of tucks alone came off the assembly lines. = In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost 469,000*2 tucks alone came off the assembly lines.