代词指代问题，求大神指点~~

薇菜莴苣

旧prep2-112
In hoping to restrain economic growth, interest rates were raised by British policymakers, making it more expensive to borrow for businesses and consumers.
(E) Hoping to restrain economic growth, British policymakers raised interest rates, making it more expensive for businesses and consumers to borrow.

整句全部划线，正确答案可以理解，问题是不清楚后面的it 起的是什么作用？
求大神指点~~

薇菜莴苣

自己顶~~求帮助呀
~！

skyemotion

指代 to borrow.

wjtwenzi

指代borrow

1.I find it pleasant to work with him.
(it 作形式宾语，代替不定式短语to work with him)
我觉得和他一起工作很愉快。
2.They felt it difficult to finish the work in such a short time.
（ it 作形式宾语，代替不定式短语to finish the work in such a short time）
他们认为在这么短的时间内完成这项工作是困难的。

3.She thinks it her duty to help us.
（ it 作形式宾语，代替不定式短语to help us）
她觉得帮助我们是她的责任。

4.I think it my honor to be invited to speak here.
（ it 作形式宾语，代替不定式短语to be invited to speak here）
我觉得应邀在这儿演讲是我的荣耀。

5.Tom didn’t find it difficult to write letters in Chinese.
（ it 作形式宾语，代替不定式短语to write letters in Chinese）
汤姆发现用汉语写信不难。

6.All these noises made it impossible for me to go on with the work.
（ it 作形式宾语，代替不定式短语to go on with the work）
这些噪音使我无法继续工作。

7.I took it for granted that they were not coming.
我想他们准是不会来的了。
8.I’ll see to it that everything is ready in time.
我负责使一切都按时准备好。