--- He worked out such different questions at a very young age.
--- Oh, he ______ a very smart student then.

A．could have been B．should have been
C．might have beenD．must have been

D

解析試題分析：考查情態(tài)動(dòng)詞表示推測(cè)。Could have done本可以做某事，實(shí)際上卻未做；should have done本應(yīng)該做某事，實(shí)際上卻未做；AB兩項(xiàng)表示的是虛擬語(yǔ)氣。CD兩項(xiàng)表示的是對(duì)過(guò)去情況的推測(cè)。might have done也許做了某事；must have done一定做了某事；句意：—在如此小的年齡，他算出了如此困難的問(wèn)題�！敲此喿x是一個(gè)非常聰明的學(xué)生了。故D正確。
考點(diǎn)：考查情態(tài)動(dòng)詞
點(diǎn)評(píng)：本題是高考必考考點(diǎn)，一定要牢記句型意思。must have done過(guò)去肯定做了某事。should have done 本應(yīng)該做而實(shí)際未做。can’t have done 過(guò)去不可能做了某事；shouldn’t have done 本不應(yīng)該做而實(shí)際做了。 need have done 本有必要做某事；needn’t have done 本沒(méi)有必要做某事；注意沒(méi)有 mustn’t have done的形式。

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But Aaron, a Japanese website developer has had enough of it. Once, the 31-year-old man approached the open window to wait for the driver to finish honking, delivered a polite "excuse me" and then yelled " Ho-o-o-o-onk!", which suggests fierce anger in Japan. Then he threw three eggs from the window of his apartment on to a passing car honking loudly below when his patience was worn out. Instead of apologizing to him, the driver threatened to kill him angrily. So, nobly, Aaron turned to non-violence. He started writing anti-honking haiku verses, a form of Japanese poetry, and submitted them to local newspapers:

Oh .forget Enron;

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"Then this kind of chain reaction started happening," Aaron says. "All these other haiku star­ted appearing that I haven't written." Aaron’ s community is now covered in anti - hon­king poetry, written by all walks of life, ranging from scary environmental activist types to violent revolutionaries:

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It’s no surprise that Aaron has started a website — www. honku. org — and now people from across the country send him news of their own anti - honking activities. It seems that poetry can change the world after all. Then, just recently, anti-anti- honking haiku started to appear, taped up by locals who thought Aaron should stop worrying about honking and start wor­rying about starving children, say, or war in the  Middle East instead. Aaron has an answer for that. "Stop me if this is too tenuous(不靠譜的) ," he says," but they talk about the violence in the Middle East like it' s a force of nature, like it' s beyond our control. But actually it's kind of like the honking - the violence is man -made. If we can figure out how to stop honking on the streets, I think we could learn some things that we could use on a large scale. "

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