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    精英家教网 > 高中英语 > 题目详情
    Can you imagine the difficulty that he had _____ the problems?

    A. to work out
    B. work out
    C. worked out
    D. working out
    D
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    科目：高中英语 来源：0104 月考题 题型：单选题

    Can you imagine the difficulty that he had _____ the problems?
    [     ]
    A. to work out
    B. work out
    C. worked out
    D. working out

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