1.【2019·天津卷·单项填空】12.The professor warned tie students that on no account _____________ use mobile phones in his class.
A. should they B. they should
C. dare they D. they dare
【答案】A
【解析】考查部分倒装。句意:这位教授警告学生们,在他的课堂上,决不应该使用手机。on no account决不,否定词放在句首,句子使用部分倒装,应该做should do,敢于做dare do,根据句意表示”应该“,故选A。