I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.A．whileB．when C．then D．as-高中英语-n多题

◎ 题干

I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.

A．while

B．when 　　

C．then 　　

D．as

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◎ 解析

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◎ 知识点

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