.________they were singing, the teacher came in. A.BeforeB.afterC.AsD.Until-英语

题目简介

.________they were singing, the teacher came in. A.BeforeB.afterC.AsD.Until-英语

题目详情

.________they were singing, the teacher came in.
A.BeforeB.afterC.AsD.Until
题型:单选题难度:偏易来源:不详

答案

C
表示正当什么时候,用as

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