Ateacher,withthreestudent,__intheofficenow.A.issittingB.aretalking

问题：Ateacher,withthreestudent,__intheofficenow.A.issittingB.aretalking

答案：↓↓↓

任晓霞的回答：

网友采纳　　选A.此题考察主谓一致.当"名词+with短语"放在句首时,谓语动词的单复数根据名词来确定.(此规律称为主语中心原则,相似用法的还有aswellas)