it is advisable that the message___sent at once.

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it is advisable that the message___sent at once.
A)be B) is C) will be D) is to be
一头雾水,
advisable是明智的，可取的。

首先要从考点入手.
本题的考察着重于虚拟语气.而虚拟语气的使用有很多种,这里出现的是由单词advisable引起的.
这点弄清楚后就好答题了.
如果语法没记住的话可以查查相关版块,我个人推荐"包天仁语法过关".
advise,suggest,order等表示建议,命令等含义的词所引起的从句中得要使用should+动词原型这种结构;而这些词的相关形容词和名词在使用中也有同样的要求
而advisable是advise的形容词形式,所以以上结构同样适用
所以不难看出,题目句子是主语从句的变化形式(即That the message be sent at once is advisable.的变化形式).从句受advisable影响,should+动词原型结构也就适用了.
因此,答案应该是A.be
解题思路很重要,希望你和老师多沟通!
Good Luck!

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