while he__(write)a letter to his pen-pal,his brother_(come)in.怎么填

分类: 作业答案 • 2021-12-18 12:07:09

问题描述：

while he__________(write)a letter to his pen-pal,his brother_________(come)in.怎么填

答

While he was writing a letter to his pen-pal, his brother came in.
整个时态是过去时,while后面要用be doing.

while he__________(write)a letter to his pen-pal,his brother_________(come)in.怎么填