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15．-Ah，Anita．Is the design for the conference center ready？
-I _____ on it for over a month，but I haven't finished it yet．（　　）
A．workedB．had worked
C．have been workingD．was working

分析 --啊哈，Anita．會議中心的設計好了嗎？
--我已經專注于這項工作一個多月，但是還沒有完成．

解答 答案是C．本題考查現(xiàn)在完成進行時．由問句中的動詞時態(tài)判斷詢問的是"現(xiàn)在的情況"，所以排除A、B和D；現(xiàn)在完成進行時表示表示從過去某時開始到現(xiàn)在這一段時間里一直延續(xù)著的動作還在繼續(xù)進行；根據答句中的"I haven't finished it yet．"可知，設計還在進行中，故選C．

點評 完成進行時的解題首先要理解其時態(tài)的基本用法--表示從過去某時開始到現(xiàn)在這一段時間里一直延續(xù)著的動作，特別關注其"在進行中"的特征；然后在語境中尋找動作的時間依據進行判斷．

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