Question

He___________the job well, but he________so careless.

A. had done;  had been

B. could do;  was

C. could have done;  was  

D. hadn’t done;  had been

Answer 1

C

解析:

答题的关键在于抓住句中的but，but后面的句子是对过去事实的陈述，应用一般过去时；前面的句子则表示“本来能够……”，是对过去事情的推断，因此应用could have done，句意为“他本来能够做好那工作，但他太粗心了。”