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Since the discovery of penicillin, millions of lives with it. [ ] A．savedB．have

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Since the discovery of penicillin, millions of lives with it. [ ] A．savedB．have

Since the discovery of penicillin, millions of lives ________ with it.

[]

A．savedB．have savedC．are savedD．have been saved

试题答案

答案：D

提示：

since作介词表示“自从……以来”，谓语动词常用现在完成时，因主语是谓语动词动作的承受者，应用现在完成时的被动语态.本题句意是“青霉素的发现使数以百万计的生命得以挽救.”

标签：penicillinmillionslivesofsince

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