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Excuse me, but i need to know if the next sentence's right
"What do you do if your best friend is angry AT YOU?"
This sentence is in my english book, but my english teacher said me that it's right, but other teacher said me that my book has a mistake, because i have to change "AT" for "WITH". I'm very confused.
American speakers usually say angry at someone, but British and other speakers more often say angry with someone, for example, I was really angry with my brother for borrowing the book without asking me.
At or Whit 
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