填什么?They increased restriction on the type of material （）dum

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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.

填什么?They increased restriction on the type of material （）dum type all the written material什么意思,快 Have they __the new type of car before they are put on the m They have increased the price of oil again the cost of living has increased什么意思英语翻译Complies with the REACH Directive the restriction of the The number of people on 65 years of age has increased 28% in i put one apple of each type on the table,为什么是of each type?应英语翻译On the other hand,rainfall increased in the interior of 英语翻译Despite the increased role of S.C.and D.C.on 《Now》,it is 英语翻译There is a disagreement on the impact of increased busin the type of （英语词组）