填什么?They increased restriction on the type of material ()dumped.They increased restriction on the type of material() dumped.A beenB不填我觉得选A,但答案选B,为啥呀?

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填什么?They increased restriction on the type of material ()dumped.
They increased restriction on the type of material() dumped.
A been
B不填
我觉得选A,但答案选B,为啥呀?

这句话在没有上下文的情况下有多种表达:
They increased restriction on the type of material (dumped).
They increased restriction on the type of material( being dumped).
They increased restriction on the type of material(to be dumped).
说明:括号内均为后置定语,表被动,限定前面的名词短语the type of material,分别表示 dump 已发生、在发生、将发生;
如果非得加 been ,句子会做调整如下:
They increased restriction on the type of material that had been dumped.