◎ 题干
Can you imagine the difficulty that he had _____ the problems?
A. to work out
B. work out
C. worked out
D. working out
◎ 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“Can you imagine the difficulty that he had _____ the problems? [ ]A. to work out B. work out C. worked outD. working out …”主要考查了你对  【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。