difficult the task may be we will try our best to complete it in time.A. WhateverB. No w

问题补充：

difficult the task may be, we will try our best to complete it in time.

A. Whatever

B. No wonder

C. Though

D. However

答案：

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。