This vase perfect but for a few small holes in its base.
A. would have been
B. should have been
C. shall be
D. would be
网友回答
A. would have been
B. should have been
C. shall be
(答案→)D. would be
解析：句意：这个花瓶要是底部没有那几个小洞就完美了。“but for a few small holes in its base”表示含蓄的条件，相当于“if there were no small holes in its base”。根据句意可知，此处应为与现在事实相反的虚拟语气，故主句用would be，所以选D项。