阿摩線上測驗
5. In this course, the field study project is _____, which means students may choose to complete it for extra credit, but it is not required for passing the class.
(A) practical
(B) optional
(C) regional
(D) vertical
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統計： A(11), B(41), C(3), D(6), E(0) #3861637
統計： A(11), B(41), C(3), D(6), E(0) #3861637
