We will never give in they do or say about our plan.A. No matter whenB. howC. whateverD.

问题补充：

We will never give in they do or say about our plan.

A. No matter when

B. how

C. whatever

D. although

答案：

A. No matter when

B. how

(答案→)C. whatever

D. although

解析：whatever引导让步壮语从句，并在从句中作宾语。