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The EMP_DEPT block in your EMPLOYEE form is based on a view in an Oracle8 database. The items in this block have the Update Allowed property set to Yes. Which database feature makes it possible to permanently modify the underlying view?（）
A:REF cursor. 
B:Instead Of trigger. 
C:Stored procedure that returns object values. 
D:The underlying view cannot be modified because DML on a view is not supported.

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出自：Oracle认证

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