—Do you often go swimming _______ Sunday mornings?

—Yes. Why not _______ with me this Sunday? [ ]

A. on; go

B. in; to go

C. on; going

D. in going

基本建设费的来源有（）。

A.预算安排经费

B.单位自筹经费

C.专项经费

D.其他基本建设经费