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题库 / OG13-SC-125
Today, because of improvements in agricultural technology, the same amount of acreage produces double the apples that it has in 1910.
double the apples that it has
twice as many apples as it did
as much as twice the apples it has
two times as many apples as there were
a doubling of the apples that it did
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AC has错误
C as much as错误 应用as many as
D two times应改为twice 前面是produces后面不能用were
E doubling没有这种用法
总结一下twice和double：
twice一般是副词，可以用twice as many/much as这样的形式，但这样的形式后面只能加本身不是numerical性质的名词，比如说dogs，cats，apples，而这类不带数字性质的词在比较时也必须加as much/many as。不能加数字或者increases这样的词。
double词性很多，但是不能加as many/much as这个形式，连接不带数字性质的词时要用double the amount(s)/number(s) of...