问题
________ the teachers is about 300 in our schooland it is becoming_____________.
A:The numberof, more and more
B:The numberof, bigger and bigger
C:A number of,more and more
D:A number of,bigger and bigger
B:The numberof, bigger and bigger
C:A number of,more and more
D:A number of,bigger and bigger
正确答案是：
