I had been puzzled over the problem for over an hour without any result,      all at once a solution flashed across my mind.
A．whileB．when
C．thenD．a(chǎn)s
B
考查連詞的用法。while當什么的時候，when正在那時，then那時，as意為，當什么的時候，句意：對這個問題我已經(jīng)困惑了一個多小時了沒有任何的結(jié)果，突然正在那時一個解決方案在我腦海閃現(xiàn)。故選B。
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