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
答題的關鍵在于抓住句中的but，but后面的句子是對過去事實的陳述，應用一般過去時；前面的句子則表示“本來能夠……”，是對過去事情的推斷，因此應用could have done，句意為“他本來能夠做好那工作，但他太粗心了�！�
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