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

【答案】while
【解析】句意:本的爸爸忙著往窗戶上加固一些木片,當(dāng)他媽媽忙著確認(rèn)收音機(jī)是否響。while當(dāng)......時(shí)候,連接兩個(gè)句子都是進(jìn)行時(shí),表示兩個(gè)動(dòng)作同時(shí)進(jìn)行。所以答案是:while。

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