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    I was about to give up my effort to solve a problem __________ a good idea struck me.

    A．when B．while C．until D．before

    A

    解析试题分析：考查连词：AB都有“当…的时候”，when表示时间点，而且和be about to连用，表示“刚要做…这时”，while表示时间段，until直到，before在…前面，句意：我刚要放弃努力解决这个问题这时哦想到一个好主意。选A。
    考点：考查连词

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