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

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統計： A(17), B(228), C(23), D(12), E(0) #568451

詳解 (共 3 筆)

#870893
我不確定是不是這樣：

70 percent alcohol is more effective than 100 percent alcohol when （it is）used as an antiseptic. 
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#1077286
antiseptic 殺菌劑 防腐劑 消毒劑
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#1101763
When alcohol is used as an antiseptic, .....
When used as an antiseptic,...
Use as an antiseptic,...
被當作是殺菌劑來用
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