The teacher suggested the dictionary ______ at once.A.be referred to be boughtB.be referred to being boughtC.referred to be boughtD.referred to being bought
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C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。