问题标题:
Youcan'timaginewahatgreattroubletheyhave____theproblem____Atosolve,beingdiscussedBsolving;beingtalkedaboutCtosolve,totalkaboutDsolving,todiscuss
问题描述:

Youcan'timaginewahatgreattroubletheyhave____theproblem____

Atosolve,beingdiscussedBsolving;beingtalkedabout

Ctosolve,totalkaboutDsolving,todiscuss

韩元山回答:
  A   havetodosth   BD的ing形和have不能搭配   beingdiscussed现在分词被动式做定语修饰problem,表示正在被讨论的问题
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