Viết lại các câu dưới đây ở dạng câu bị động
1.He has already prepared the report
- The report has been already prepared
2.We have bought tickets to the concert
-Tickets to the concert have been bought
3.She has written a test today
-A test has been written today
4.Pam has found the s in the table
- The s has been found in the table by Pam
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