填空题

___________________________ (科学家太专注于他的工作) that he didn’t notice her enter the lab.

【参考答案】

The scientist was so absorbed in his work
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Doctors assume that Seasonal Affective Disorder might occur when there is a higher degree of released ______.
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The writer cites Jascha Heifetz’s example mainly because ______.
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C．he ends every show gracefully
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