_____ they were sweeping the floor ,John came backA thoughB while_英语解答

_____ they were sweeping the floor ,John came back
A though
B while
C until
D before

人气：213 ℃　时间：2020-04-18 03:42:07

解答

选B,while表示“当……时”,特别地用于表示“当……正在做某事时”