Question

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

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

Answer 1

【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。