问题补充：
Don handle the vase as if it made of steel.(·北京)
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：句意：不要这么拿着这个花瓶，就好像它是钢制成似的。as if意为“好像”，分析句意可知as if后面的句子须使用虚拟语气，并且所述情况是对现在事实的假设，因此使用一般过去时，故选择B项。
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