One feels it hard to fit in with a new culture _______ he has been accustomed to his won culture.

A．the moment

B．which

C．now that

D．as

施工、房地产开发企业缴纳城乡维护建设税的计税依据是( )。

A．营业收入

B．营业税

C．增值税

D．营业税和增值税