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For years, doctors _____ millions of patients’ lives with the help of microscopes:

单选题
2022-03-12 19:34
A、have saved
B、are saving
C、will save
D、were saving
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正确答案
A

试题解析

本题考查现在完成时。句意:多年以来,医生们已经借助于显微镜挽救了数百万人的生命。状语“多年来”指从过去某一时刻开始起一直持续到现在,是典型的用来指导完成时的标志。A项是过去完成时,其他都不是。

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