An increasing number of students,year by year,across China  _______ hard to realize their dream of studying abroad.

A．try

B．have tried　

C．will try

D．are trying

学校（）聘用曾经因故意犯罪被依法剥夺政治权利的人担任工作人员。

A.可以

B.不得

C.特殊情况可以

D.经批准可以