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问题: 谁帮我解释一个英语选择题

12. You can’t imagine what great trouble they have _____ the problem _____.
A. to solve; being talked about
B. B. solving; discussing
C. to solve; to talk about
D. D. solving; being discussed

答案是D 为什么?

解答:

imagine的宾语是what 引导的整个句子一直到句尾( 其中they have是定语从句,修饰先行词trouble;
而trouble的用法是:have trouble (in) diong sth.此处正是这个句型的变形;
第二空being discussed 也是定语,修饰the problem,表示“正在(被)讨论的问题”。
所以,答案是D啊。