A serious illness, its nature, is almost always painful.
A. whatever
B. wherever
C. whenever
D. however
网友回答
(答案→)A. whatever
B. wherever
C. whenever
D. however
解析:考察让步状语从句,本句在nature后面省略了is。Whatever引导起这个让步状语从句,并在句中作为is 的表语。BCD三项都是副词,通常不能在句中作表语。句意:无论是什么样的性质,一种严重的疾病总是会让人痛苦。故A正确。