◎ 题干
You can not imagine the difficulty they had ____ the problem. It isn't ____ easy.
[     ]

A. to solve; so
B. solved; so
C. solving; that
D. solved; that

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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 not imagine the difficulty they had ____ the problem. It isn't ____ easy. [ ]A. to solve; so B. solved; soC. solving; that D. solved; that …”主要考查了你对  【副词】【动名词】  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。