You can't imagine wahat great trouble they have____the problem ____A to solve ,being discussed B solving ;being talked aboutC to solve,to talk about D solving,to discuss
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![You can't imagine wahat great trouble they have____the problem ____A to solve ,being discussed B solving ;being talked aboutC to solve,to talk about D solving,to discuss](/uploads/image/z/8049516-60-6.jpg?t=You+can%27t+imagine+wahat+great+trouble+they+have____the+problem+____A+to+solve+%2Cbeing+discussed+B+solving+%3Bbeing+talked+aboutC+to+solve%2Cto+talk+about+D+solving%2Cto+discuss)
You can't imagine wahat great trouble they have____the problem ____A to solve ,being discussed B solving ;being talked aboutC to solve,to talk about D solving,to discuss
You can't imagine wahat great trouble they have____the problem ____
A to solve ,being discussed B solving ;being talked about
C to solve,to talk about D solving,to discuss
You can't imagine wahat great trouble they have____the problem ____A to solve ,being discussed B solving ;being talked aboutC to solve,to talk about D solving,to discuss
A
have to do sth
BD的ing形和have不能搭配
being discussed现在分词被动式做定语修饰problem,表示正在被讨论的问题
A
B
You can't imagine wahat great trouble (they have)____the problem( ____)
括号内为定语从句
have trouble (in) doing sth
B