14．I had been puzzled over t he problem for over an hour without any result, all at once a solutio——青夏教育精英家教网—

摘要：14．I had been puzzled over t he problem for over an hour without any result, all at once a solution flashed across my mind. A．while B．when C．then D．as

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

A．while B．when

C．then D．as

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

A．while B．when

C．then D．as

查看习题详情和答案>>

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