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He _____the job well, but he ____so careless.
A．had done; had been B．could do; was
C．could have done; wasD．hadn’t done; had been
C
答題的關(guān)鍵在于抓住句中的but，but后面的句子是對(duì)過(guò)去事實(shí)的陳述，應(yīng)用一般過(guò)去時(shí)；前面的句子則表示“本來(lái)能夠……”，是對(duì)過(guò)去事情的推斷，因此應(yīng)用could have done，句意為“他本來(lái)能夠做好那工作，但他太粗心了。”
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