19. Tracy has a private English tutor, and she has three _____ with him each week.
(A) copies
(B) ratings
(C) sessions
(D) instruction
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統計: A(3), B(13), C(251), D(57), E(0) #1835481
統計: A(3), B(13), C(251), D(57), E(0) #1835481