单选题Can 16-year-old students 

问题补充：

单选题Can16-year-oldstudentsdrivetoschool?No,theyshouldn’t______todrivebecausetheyaren’tseriousenough.A.allowB.be allowedC.allowedD.have allowed

答案：

B解析从上下文可知，他们是被许可的对象，所以用被动语态，选B。