-I'm afraid I can't return your book by Friday.    

-________. There is no need to return it hurriedly.  [ ]

A. Go ahead                        

B. Take it easy    

C. Come on                        

D. Take your time  

我国复式预算中属于经常性预算的主要收入来源是（）.

A.债务收入

B.税收收入

C.国有企业资产收益

D.政府收费