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New TOEFL IBT Pratice Test #003
New TOEFL IBT Pratice Test #003
Listening | Question 16 of 18
Listen to an Academic Talk
In the professor's example, what is the opportunity cost of going to the concert?
A) The money paid for the ticket
B) The time spent at the concert
C) The enjoyment of the music
D) The potential for a better exam grade