They __(not be)at school the day before yesterday.

问题描述:

They __(not be)at school the day before yesterday.

weren't
yesterday 昨天,故用一般过去时; 主语是THEY ,故BE 用WERE,否定形式是;WEREN’T .
如果不明白,请再问;如果对你有所帮助,请点击本页面中的“选为满意回答”按钮,