24. To my surprise,he have failed the driving test a third time,but he            . (ought)

令我驚訝的是，他第三次駕照考試居然又沒過！但他本不該會是這樣的，

24. oughtn't to have考查不定式的省略結構。當不定式部分的內(nèi)容是上文已經(jīng)出現(xiàn)的內(nèi)容時，為避免重復，不定式一般式可僅保留不定式符號to;當不定式中的動詞為be時，要保留tobe; 當不定式動詞以其他時態(tài)體現(xiàn)時，只需省略表實際意義的動詞及其后續(xù)部分，而保留其他:，空白處的完整說法是oughtn't to have failed the driving test a third time。

題目來源：高考丟分題英語 > 專題訓練5:倒裝和省略

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