大力士拉轮胎小班教案:Something unusual was ______(cover) during their exploration under the sea.

来源:百度文库 编辑:神马品牌网 时间:2024/05/09 07:54:11
横线上是不是填 discovered啊?

Right.
这是被动语态,谓语是:be+ done(过去分词)

dui