6．---Has David finished his project yet？
---I guess not．He ___________ on it at lunch time．Do you want me to confirm it？（　　）
A．is workingB．was workingC．has workedD．had worked

分析 翻譯：戴維完成了他的計劃了嗎？
我猜沒有，他在午餐時間還在工作，你想讓我證實一下嗎？

解答 根據(jù)I guess not．He ___________ on it at lunch time可知他在午餐時間正在工作，再由Do you want me to confirm it可知應用過去進行時，故選：B．

點評 首先理解句意，然后根據(jù)句境判斷出時態(tài)，注意區(qū)分現(xiàn)在進行時，過去進行時即可．

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