阿摩線上測驗
II. Grammar: Please choose the BEST answer for each question.
11. How long does the medication remain _______?
(A) effect
(B) effectuate
(C) effectively
(D) effective
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統計： A(38), B(13), C(64), D(326), E(0) #1814822
統計： A(38), B(13), C(64), D(326), E(0) #1814822
