The problem just ---in their diacussion is an important one.A,to be refered to B.referred toC.referring to D.referred 选b,why

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The problem just ---in their diacussion is an important one.A,to be refered to B.referred toC.referring to D.referred 选b,why
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The problem just ---in their diacussion is an important one.A,to be refered to B.referred toC.referring to D.referred 选b,why
The problem just ---in their diacussion is an important one.A,to be refered to B.referred to
C.referring to D.referred 选b,why

The problem just ---in their diacussion is an important one.A,to be refered to B.referred toC.referring to D.referred 选b,why
refer to...谈到,谈起.这里用过去分词短语作定语,表示被动关系,即the problem 是refer to动作的承受者.

B 过去分词作后置定语，表示被动。refer to 表示提及

B 过去分词做定语，表示被动