Question

【题目】Ben's dad was putting pieces of wood over the windows w his mom was making sure the radio was working.

Answer 1

【答案】while
【解析】句意：本的爸爸忙着往窗户上加固一些木片,当他妈妈忙着确认收音机是否响。while当......时候，连接两个句子都是进行时，表示两个动作同时进行。所以答案是：while。