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英语
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Sleep is ( ) to our health.
A.useful
B.necessary
并讲解原因
人气:460 ℃ 时间:2020-06-18 12:47:00
解答
选B,因为necessary有必不可少的意思,而不是单纯的有帮助,useful只是有用的,睡眠不只是有用,而是不可以不睡.
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