◎ 题干
You can imagine what great trouble they have ______ the problem ______.
[     ]

A. to solve; being talked about
B. solving; discussing
C. to solve; to talk about
D. solving; being discussed

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“You can imagine what great trouble they have ______ the problem ______. [ ]A. to solve; being talked about B. solving; discussing C. to solve; to talk abo…”主要考查了你对  【动词短语】【现在分词的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。