The doctor __his temperature before he_to his chest.a.has taken;listened b.had taken;listened c.took;had listened d.took;listened是哪个?为什么呢?

分类: 作业答案 • 2021-12-19 16:18:30

问题描述：

The doctor ______his temperature before he_____to his chest.
a.has taken;listened b.had taken;listened c.took;had listened d.took;listened
是哪个?为什么呢?

答

b,had发生于vt-ed之前.过去完成时发生于一般过去式之前

The doctor ______his temperature before he_____to his chest.a.has taken;listened b.had taken;listened c.took;had listened d.took;listened是哪个?为什么呢?