difficult the task may be, we will try our best to plete it in time.
A. Whatever
B. No wonder
C. Though
D. However
网友回答
A. Whatever
B. No wonder
C. Though
(答案→)D. However
解析：考查让步状语从句：句意：无论这个任务多么困难，我们都会尽力及时完成的。However+adj/adv+主谓，whatever修饰名词，no wonder难怪，though虽然，选D。