13. ____ were invented, patients had to be held down by force during painful operations.(A) As anest

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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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答案：C
難度：適中0.65
書單：沒有書單，新增

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Anesthetics=麻醉藥在麻醉藥發........

上一篇 : 12. Advertising ____ children and teenagers can be destructive and should be controlled.(A) aiming a
下一篇 : 14. Each of the candidates’ names ____ written on pieces of paper, folded in half, and placed in the

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