— Shall we go to the "Bird's Nest" stadium this weekend? 

— Oh, with all so much homework _____, I don't know if I'll have time to go out. [ ]

A. to do

B. doing

C. done

D. do

原始凭证应当具备的内容有______。

A．凭证的名称和填制凭证的日期

B．接受凭证的单位印章

C．接受凭证的单位全称

D．经济业务内容、数量、单价和金额