He﹍﹍the job well, but he    so careless.
A．had done; had beenB．could do; was
C．could have done; wasD．hadn’t done; had been
C
這題考查虛擬語氣，句意是：他本可以做得很好，但是他太粗心了。粗心是過去的事實，工作做得好的虛擬的用法，實際上并不好。所以第一空填could have done“本可以做卻沒做”，第二空填was，是過去的事實。選C
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