创立了“三三制” * * 组织形式和保障 * * 等崭新内容的宪法或者宪法性文件是

A．《中华苏维埃共和国宪法大纲》

B．《抗日救国十大纲领》

C．《陕甘宁边区宪法原则》

D．《陕甘宁边区施政纲领》

Most of the big hotels in Shanghai were full last week, but finally we _____ find a room in a small one. [ ]

A. ought to

B. could

C. were able to

D. might