we were having a party when the train started 用while 改为同义句while we ---- ---- a party ,the train ----

分类: 作业答案 • 2021-12-19 15:48:30

问题描述：

we were having a party when the train started 用while 改为同义句
while we ---- ---- a party ,the train ----

答

were having, started

答

while we were having a party ,the train started .