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【題目】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:凱瑟琳的那首詩一直創(chuàng)作了一個月，它現在仍然沒有完成。開始于過去的動作，對現在造成影響，并一直持續(xù)，用現在完成進行時。

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