----What’s that smell?-- I don’t know but it is it’s terrible!A. whateverB. howeverC

问题补充：

----What’s that smell?

---- I don’t know, but it is, it’s terrible!

A. whatever

B. however

C. whichever

D. wherever

答案：

(答案→)A. whatever

B. however

C. whichever

D. wherever

解析：考查让步状语从句。Whatever引导让步状语从句，并作表语；句意：—那是什么味道？—我不知道。但是，不管那个味道是什么，都很难闻。