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题库 / Prep2008E2-SC-222
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.
the numbers of trucks alone
that number of trucks alone
the number of trucks by themselves
as many trucks themselves
as many trucks by themselves
请看讲解视频
A. the numbers指代不清
B. Correct；came off作过去分词修饰trucks；that number指代前面总和的469000，如果是the number，没有指代对象，似乎说是the number of trucks。
C. the number指代不清；且alone比by themselves好，句意为强调"单单是卡车就有那么多了", 而不是强调"卡车它们自己怎么怎么样"，所以不用themselves。
D. twice结构不完整，少一个as，by themselves错误同C。
E. 错误同D。
补充说明
倍数表达方法总结：
"A + be + 倍数 + as + 计量形容词原级 + as + B
"A + be + 倍数 + 计量形容词比较级 + than + B"
"A + be + 倍数 + the + 计量名词 + of + B"
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