The teacher suggested the dictionary at once.A. be referred to be boughtB. be referred to

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A. be referred to be bought
B. be referred to being bought
(答案→)C. referred to be bought
D. referred to being bought
解析：考查虚拟语气和句子结构。本题中的referred to修饰the dictionary,因为两者存在着被动的关系，所以使用过去分词的形式。Suggest（建议）后面的宾语从句使用should+动词原形的虚拟语气，should可以省略。本题在referred to后面省略了should.句意：老师建议被提到的那个字典应该立刻被购买。故C正确。