Don't handle the vase as if it made of steel.
A. is
B. were
C. has been
D. had been
网友回答
A. is
(答案→)B. were
C. has been
D. had been
解析：考察虚拟语气。As if后面的句子如果表示的是假的事情，则使用虚拟语气。与现在将来相反，用过去时，be动词用were；与过去相反，则使用过去完成时。根据句意可知本题是表示与现在相反，故使用were；句意：不要那样放花瓶，好像它是铁做的一样。故B正确。