作业帮it is astonishing that so many people should be absent.这句话 为什么用should be?
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it is astonishing that so many people should be absent.这句话 为什么用should be?
it is astonishing that so many people should be absent.这句话 为什么用should be?
it is astonishing that so many people should be absent.这句话 为什么用should be?
因为是虚拟语气.
should 翻译为竟然，should的特殊用法
It is +形容词+that引导一个主语从句，如果这个形容词表示说话者的强烈思想感情，那么，主语从句要用虚拟语气，即谓语动词用should do.作“竟然”解。如：
It is so strange that he should invite them to dinner.他竟然请他们吃饭，这太奇怪了。
相关形容词还有：impossible,important,amazing等。...
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It is +形容词+that引导一个主语从句，如果这个形容词表示说话者的强烈思想感情，那么，主语从句要用虚拟语气，即谓语动词用should do.作“竟然”解。如：
It is so strange that he should invite them to dinner.他竟然请他们吃饭，这太奇怪了。
相关形容词还有：impossible,important,amazing等。
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在主语从句中,虚拟语气用"should+动词原形"或只用动词原形.这种主语从句由连词that引导.
eg：
1. It is /was +adj. 形容词(important / necessary/ essential/ impossible/ natural/ unthinkable/ strange/ surprising ,etc.)+that...当It is stran...
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在主语从句中,虚拟语气用"should+动词原形"或只用动词原形.这种主语从句由连词that引导.
eg：
1. It is /was +adj. 形容词(important / necessary/ essential/ impossible/ natural/ unthinkable/ strange/ surprising ,etc.)+that...当It is strange /surprising that 常译为"竟然"
2.It is / was +n. 名词(a pity /a shame/ an honour/ a surprise/ no wonder.etc.) +that...
3.It is /was +p.p过去分词(suggested/ requested/ required/ ordered/ proposed/ decided,etc)+that
因此此题属于虚拟语气中主语从句的第一个句型:It’s astonishing(形容词) that so many people (should) be absent.
竟然有那么多人缺席真是让人惊讶。
后面的should可以省略.
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should 的感情色彩有很多种，这里是表惊讶。
看一下牛津或朗文字典，解释比较全。