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Which three statements describe the functionality of the DO_KEY built-in?（）
A:It accepts both a built-in and a key name as argument. 
B:If no key trigger is defined, the specified built-in executes. 
C:Its parameter must be specified in upper case, enclosed in single quotation marks. 
D:It performs the same task as if you pressed the function key associated with the specified argument. 
E:It executes the key trigger that corresponds to the built-in specified as its parameter. 

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出自：Oracle认证

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