来源:网络资源 2009-05-11 19:00:37
1.have you ________ been to Beijing?
No _____.
2.I have ______ finished my work.
3.I have finished my work_______.
4.Have you finished your work______?
5.She has taught English _____ 10 years.
6.He has worked in the factory ______1 year ago.
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