请教新概念英语二册63课 He suggested that a double railway-tunnel should/ʃəd/ be built.中should,应用在第一人称啊.为什么这句中用了它呢?

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请教新概念英语二册63课 He suggested that a double railway-tunnel should/ʃəd/ be built.中should,应用在第一人称啊.为什么这句中用了它呢?
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请教新概念英语二册63课 He suggested that a double railway-tunnel should/ʃəd/ be built.中should,应用在第一人称啊.为什么这句中用了它呢?
请教新概念英语二册63课 He suggested that a double railway-tunnel should/ʃəd/ be built.中
should,应用在第一人称啊.为什么这句中用了它呢?

请教新概念英语二册63课 He suggested that a double railway-tunnel should/ʃəd/ be built.中should,应用在第一人称啊.为什么这句中用了它呢?
这里是 suggest 的一个用法,结构为:
suggeste that sb.should do sth.
不管是第几人称,都是这样的结构,此句型中的should 可以省略.
eg.
The teacher suggested that we (should) take notes in class.
老师建议我们上课时做笔记.
I suggest that he (should) turn to his parents for help.
我建议他向父母求助.
单选题中也容易考这个知识点:
1.They suggested we ________ at once.
A.went B.go C.must go D.shall go
2.I suggest that the presents ________ inmmediately.
A.to mail B.should mail C.to be mailed D.be mailed

should表示“应该”,没有人称的限定 ,shall用于第一人称

该处should表示“应该(含建议的意思)”,没有人称的限定,
但如果should作为shall的过去式,用来表示“将”(表示将来、过去),此处明显不是