It doesn’t matter when【C1】______a person sleeps, but everyone needs some rest to stay alive. That’s【C2】______all doctors tho

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问题     It doesn’t matter when【C1】______a person sleeps, but everyone needs some rest to stay alive.
    That’s【C2】______all doctors thought, until they heard about A1 Herpin. People said he never【C3】______. Could this be true’?. The doctors decided to see this strange man【C4】______. A1 Herpin was 90 years old when doctors went to his home. They【C5】______that he got some sleep of some kind. So they stayed with him and watched him. But they were【C6】______. Though they watched him hour【C7】______hour and day after day, they never saw Herpin sleeping. In fact, he did not even have a bed. He never needed one. The only rest he got was【C8】______in a chair and reading newspapers. The doctors were puzzled(疑惑)by this strange sleeplessness. They asked him many questions,【C9】______to find an answer. They found only one answer that might【C10】______this. Herpin’s mother was injured(受伤)several days before he was born. But that was all. Was that the real reason? Nobody could answer the question.  
【C7】

选项 A、after
B、by
C、and

答案A

解析 hour after hour表示“一小时又一小时”,用法与后面紧随着的day after day用法相同。
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