50 Which of the following can best replace the word “stints” in the passage?
(A) Pays
(B) Periods
(C) Studies
(D) Trips
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統計: A(1), B(17), C(4), D(4), E(0) #2994193
統計: A(1), B(17), C(4), D(4), E(0) #2994193