(2011·重庆)It is still under discussion the old bus station should be replaced with a modern hotel or not.
A. whether
B. when
C. which
D. where
网友回答
(答案→)A. whether
B. when
C. which
D. where
解析：考查主语从句的引导词。句意：这个旧汽车站是否应该被一个现代化的旅馆取代还在讨论之中。本句中的It是形式主语，真正的主语是从句“whether the old bus station should be replaced with a modern hotel or not”。whether在句中引导主语从句。