It is recommended by the representatives that traditional cultures _____
A．should preserveB．have been preserved
C．be preservedD．must be preserved
C

試題分析：考查虛擬語氣：句意：代表推薦傳統(tǒng)文化應該保留。這是it做形式主語的句子，that引導的是真正的主語從句，主句中的謂語是recommend。主語從句中的謂語用虛擬語氣，should do，should可以省略，而且傳統(tǒng)文化是被保留，選C。
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