公安数字身份证书的发放原则为（）。
A.每人一个
B.在职民警每人一个
C.按需发放
D.强制购买
参考答案：B
—Which team are you going to play _______ the day after tomorrow?
—A team from No.7 Middle School. I hope we will win.
A.about B.with C.against
Three years ____ a long time for us students.
A．are
B．be
C．is
D．have been
