We’ve made up our mind to finish this experiment no matter difficult it was.A. whatB. whe

问题补充：

We’ve made up our mind to finish this experiment no matter difficult it was.

A. what

B. when

C. how

D. how much

答案：

A. what

B. when

(答案→)C. how

D. how much

解析：no matter how+ adj.意为:无论如何, 不管怎样.