19. The professor required that George _____ his term paper by 8 p.m. tomorrow.
(A) submit
(B) submits
(C) submitted
(D) submitting
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統計: A(504), B(253), C(100), D(119), E(0) #2818035
統計: A(504), B(253), C(100), D(119), E(0) #2818035