In my opinion his suggestionright or not should be considered.A. ifB. whichC. whenD. whet

问题补充：

In my opinion，his suggestionright or not，should be considered.

A. if

B. which

C. when

D. whether

答案：

A. if

B. which

C. when

(答案→)D. whether

解析：本题考查由whether引导的让步状语从句，意为“不管；无论”。句意为“依我看来，不论他的提议正确与否，都应该予以考虑”。