13. ____ were invented, patients had to be held down by force during painful operations.
(A) As anesthetics
(B) Because anesthetics
(C) Before anesthetics
(D) Anesthetics
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統計: A(59), B(35), C(426), D(7), E(0) #2429972
統計: A(59), B(35), C(426), D(7), E(0) #2429972