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    精英家教网 > 高中英语 > 题目详情
    I was about to give up my effort to solve a problem __________ a good idea struck me.
    A．whenB．whileC．untilD．before
    A

    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。
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