2. 外语
  3. For years, doctors ______ millions of patients’ lives with the help of ______ microscopes.

For years, doctors ______ millions of patients’ lives with the help of ______ microscopes.

admin2008-11-29  33
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。
转载请注明原文地址:https://jikaoti.com/ti/1oCMFFFM
本试题收录于： 大学英语三级A级题库大学英语三级分类
0

大学英语三级A级

大学英语三级

相关试题推荐
随机试题
最新回复(0)