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New TOEFL IBT Pratice Test #007
New TOEFL IBT Pratice Test #007
Listening | Question 16 of 18
Listen to an Academic Talk
In the professor's example, what is the opportunity cost of choosing to study?
A) The money spent on textbooks
B) The value of not attending a movie
C) The chance of getting a better grade
D) The time it takes to get to the library