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：这题考查过去分词做定语和虚拟语气的用法：referred to是过去分词做定语，修饰the dictionary，又因为suggest表示“建议”时，宾语从句用sb （should） do的虚拟语气，选C。