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[单选] How can he do so much work? He ________stay late at the office every evening and take work hom

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[单选] John________he could improve his exam results, but he did not have enough time to study.

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[单选] The development of the light bulb ________partly as a result of the widespread availability of

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[单选] 根据题干回答题下列各种震颤,最常见于何种疾病?胸骨左缘第2肋间触及收缩期震颤 (  )

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