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JLPT N1 · Question 13
Which word fits the blank?
その薬品はよく効くが、
____
作用が不安だ。
Answer options
反
逆
副
非
Vocabulary
その薬品
そのやくひん
— that medicine; that drug
効く
きく
— to work; to be effective
作用
さよう
— effect; action
不安
ふあん
— anxiety; concern
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