问题详情：
改错：(2019·天津高考)The professor warned the students that on no account they should use mobile phones in his class.
________________________________________________________________________
【回答】
should置于they前 此处表示否定含义的介词短语on no account位于宾语从句句首，宾语从句要用部分倒装结构，故将should置于they前。
知识点：完成句子
题型：短文改错
