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19. _____, measles can now be prevented by a vaccine.
(A) Since a serious health hazard
(B) It was once a serious health hazard
(C) That once a serious health hazard
(D) Once a serious health hazard


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 【站僕】摩檸Morning:有沒有達人來解釋一下?
倒數 3天 ,已有 1 則答案
Lola 大三下 (2019/03/31):

(A) Since a serious health hazard

since  conj  因為,自從)--語意不通

(B) It was once a serious health hazardmeasles can now be prevented by a vaccine.  --兩個動詞文法不通

(C) That once a serious health hazard +動詞

(D) Once a serious health hazard 

(Once conj 一旦 )

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19. _____, measles can now be prevented ..-阿摩線上測驗