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Hi teachers~

I am looking for an expression for this situatuon.

A is in an English discussion class. His teacher usually picks topics but they are difficult for him so he decides to pick topics before his teacher.

I am looking for an expression to describe a situation where A does sth first before sb else does it.

Can you help me?

Thanks in advance~

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Check out the definitions of 'preempt' here and see if that's what you're looking for.

https://en.oxforddictionaries.com/definition/us/preempt

CJ