4. Having run for just a week,the machine            that quick. (break)

只用了一個星期，這臺機器不應(yīng)該那么快就壞了。

4. shouldn' t have broken down考查虛擬語氣的用法。對已經(jīng)發(fā)生的事表示虛擬，用should have done o(機器) 壞掉break down 

題目來源：高考丟分題英語 > Unit 4 Sharing

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