It is remended by the representatives that traditional cultures
A. should preserve
B. have been preserved
C. be preserved
D. must be preserved
网友回答
A. should preserve
B. have been preserved
(答案→)C. be preserved
D. must be preserved
解析：考查虚拟语气：句意：代表推荐传统文化应该保留。这是it做形式主语的句子，that引导的是真正的主语从句，主句中的谓语是remend。主语从句中的谓语用虚拟语气，should do，should可以省略，而且传统文化是被保留，选C。