Don’t treat the vase as if it made of steel.A. isB. wasC. were D. had been

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A. is
B. was
(答案→)C. were
D. had been
解析：考查虚拟语气。As if（似乎）后面的宾语从句如果表示假的事情，要使用虚拟语气。与现在相反的时候使用过去时（be动词用were）；与过去相反使用过去完成时。本题是与现在相反，故使用过去时。句意：不要拿那个花瓶就好像它是铁做的一样。故C正确。