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In paragraph 3, the author mentions friends' invitation to social gatherings and a phone f
A.Prove the idea that friendships sometimes can be nothing but a waste of time.
B.Show us that no matter how busy we are, we still need all our friends.
C.Indicate the idea of "ask what your friends can do for you, but what you can do for your friends".
D.Give us some examples to deal with some friendships we need to cool off.
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