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【题目】This medicine _______ millions of people’s lives since it was put into use.

A. is savingB. will saveC. has savedD. had saved

【答案】C

【解析】

句意:这种药物自从投入使用以来已经挽救了数百万人的生命。since后跟从句,表示“自……以来”,说明的是现在的状况,判断用现在完成时态,故答案为C。

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