问题补充：
(·北京高考)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：选B考查虚拟语气。句意：不要把花瓶像它似乎是钢制的一样来拿。as if表示“似乎，好像”，引导的从句通常用虚拟语气，再结合主句的时态可知是对现在事实的虚拟，所以用一般过去时were。
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