I was about to give up my effort to solve a problem __________ a good idea struck me.
A．whenB．whileC．untilD．before
A

試題分析：考查連詞：AB都有“當(dāng)…的時(shí)候”，when表示時(shí)間點(diǎn)，而且和be about to連用，表示“剛要做…這時(shí)”，while表示時(shí)間段，until直到，before在…前面，句意：我剛要放棄努力解決這個(gè)問(wèn)題這時(shí)哦想到一個(gè)好主意。選A。
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