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

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A. is
(答案→)B. were
C. has been
D. had been
解析：考察虚拟语气。as if“仿佛，好像”其后内容若与事实不符则用虚拟语气，花瓶不是用钢做的，因此选择B。句意：别把这花瓶拿得跟它好像是用钢做的似的。