Question

the population of our students was _that of theirs. A twice as large as B twice as much as

原因是什么呢？

Answer 1

A twice as large as 是对的。
这是倍数/分数表达的词序问题。“A 是B的几倍/几分之一。。。”的正确词序是：A+be 倍数/分数+as +形容词/+as B
此外，与population搭配的形容词是large/great/big，如：a big/large/great population，或者 the population is big/large/great,而不能用much或者many。

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Answer 2

选A

我们学生的人数是他们的两倍。

population与large这个形容词连用，表示数量大。固定搭配
例如：
China has a large population.中国人口数量众多
With a strong economy, a large population and still relatively low per capita consumption of dairy products, the market retains huge growth potential.
由于经济增长强劲、人口庞大、人均乳制品消费量仍相对较低，中国市场仍然具有巨大的增长潜力。

Answer 3

A twice as large as

Answer 4

B