問題詳情

17. ____, 70 percent alcohol is more effective than 100 percentalcohol.
(A) An antiseptic used
(B) When used as an antiseptic
(C) An antiseptic when used
(D) How an antiseptic is used

參考答案

答案:B
難度:簡單0.801802
統計:A(7),B(89),C(8),D(3),E(0)

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