with no approval needed from regulators before the raising of
approval was not needed from regulators before the raising of rates.
独立主格结构（后加过去分词）丢失动作发出者。
ron的解答：https://www.manhattanprep.com/gmat/forums/the-investigations-of-many-psychologist-t1646.html
Idiomatic usage. In the phrase 'little of X', the X has to be a singular quantity. If it's plural (like 'differences'), then you have to use few.
eg. There was very little food left over at the end of the party.
There were very few crab cakes left over at the end of the party.
The biologist-as-historian and the general historian of human events dealt with comparable phenomena and assumed necessarily a common mode of explanation.
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C 依图形背景原则可知，本选项的主从句反了。在逻辑上，肯定是先有的规章制度的内容，然后这个制度才会引起争议。因此，“规章制度的内容”持续的时间必然长于“激起争端”的时间，即，stimulate应为主句。