题目内容
【题目】Katherine __________ on that poem for a month, and it's still not finished.
A. had been working B. has been working
C. has worked D. had worked
【答案】B
【解析】句意:凯瑟琳的那首诗一直创作了一个月,它现在仍然没有完成。开始于过去的动作,对现在造成影响,并一直持续,用现在完成进行时。
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