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英语
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It is desirable that the airplane be as light as possible.为什么要用be?
请解释得详细一点···
人气：304 ℃ 时间：2020-02-04 10:50:04
解答
虚拟语气,把should省略了.当advisable desirable urgent 等表示强烈的情感,意见,意图的词作表语或补语时,从句用虚拟,比如 it is important that all figures be checked
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