请问Our music teacher played the piano while we __?

分类: 作业答案 • 2022-05-23 18:09:59

问题描述：

请问Our music teacher played the piano while we __?
A.have sungB.had sungC.were singingD.would sing注意说明下为什么选哪个?也就是翻译下,便于那些不会的乱答,

答

C.were singing
过去进行时,表示2个动作同时发生