题目内容：

Some scholars argue that a large population makes ______ would otherwise be unprofitable,especially railroads,highways,irrigation systems and pots.
A.it profitable that many social investments
B.profitable that many social investments
C.many profitable social investments that
D.profitable many social investments that
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优质解答

选D.Some scholars argue that ...是句子的最主干结构,主语、谓语、加上宾语从句,应该能理解吧?现在说宾语从句的里面：a large population makes profitable many social investments 到这也可以理解吧?“一个很大的...