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

admin2008-11-29 67

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://www.kaotiyun.com/show/M0SK777K

大学英语三级A级

相关试题推荐

随机试题

最新回复(0)