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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