John is determined to carry out the important experiment _______

John is determined to carry out the important experiment ________ happens, he will not change his plan.
A、However
B、Whatever
C、What
D、Wherever
【正确答案】：B
【题目解析】：约翰决心进行这个重要的实验，无论发生什么事，他都不会改变他的计划。 whatever happens 无论发生什么。