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For years, doctors ______ millions of patients’ lives with the help of ______ mi
For years, doctors ______ millions of patients’ lives with the help of ______ mi
游客
2024-07-11
42
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问题
For years, doctors ______ millions of patients’ lives with the help of ______ microscopes.
选项
A、have saved
B、are saving
C、will save
D、were saving
答案
A
解析
本题考查对时态的掌握。由时间状语For years可知,本题应该用现在完成式。
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