问题
选择题
---Sixteen-year-olds can drive their cars to school?
---No. They shouldn’t ______ to drive their cars to school because are not serious enough.
A．allow
B．allowed
C．Be allowed
D．Have allowed
答案
答案：C
考察被动语态,这句话总他们是被允许的对象,故用被动语态,选C.