Don't handle the vase as if it made of steel.A. isB. wereC. has beenD. had been

问题补充：

Don handle the vase as if it made of steel.

A. is

B. were

C. has been

D. had been

答案：

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。