19. _____, follow the directions on the bottle carefully.
(A) When taken drugs
(B) When one takes drugs
(C) When taking drugs
(D) In taking drugs
(E) Being taken drugs
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統計: A(6), B(33), C(240), D(11), E(10) #1950071
統計: A(6), B(33), C(240), D(11), E(10) #1950071