This printer is of good quality. If it_____break down within the first year,we would repair it at our

expense.[ ]

A. would    

B. should    

C. could    

D. might

现行宪法序言明确宣告本宪法规定了国家的根本制度和（）

A.政治制度

B.社会制度

C.国家制度

D.根本任务