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    精英家教网 > 初中英语 > 题目详情
    I worked on the problem ____ a long time and I worked it out ____ myself ____ last.

    A. for; by; at
    B. in; with; on
    C. on; by; in
    D. for; for; at the
    A
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    科目：初中英语 来源：专项题 题型：单选题

    I worked on the problem ____ a long time and I worked it out ____ myself ____ last.
    [     ]
    A. for; by; at
    B. in; with; on
    C. on; by; in
    D. for; for; at the

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