7. They        ，but both of them went to bed early last night and totally forgot about it. (set)

他們應(yīng)該著手做準(zhǔn)備，但他們昨晚卻早早地上了床，完全忘了這件事。

7. should have set about making / set out to make preparations考查set out to do sth. / set about doing sth.和虛擬語(yǔ)氣的用法。set out to do sth. / set about doing sth.都是"著手做某事"的意思。從句意判斷是他們本該著手做而沒(méi)做，因此用should have done;, shouldn' t have done表示本來(lái)不應(yīng)該做某事而實(shí)際做了。含有指責(zé)對(duì)方或自責(zé)的含義。

題目來(lái)源：高考丟分題英語(yǔ) > Unit 3 Inventors and inventions

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