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

試題分析：考查虛擬語氣。As if（似乎）后面的賓語從句如果表示假的事情，要使用虛擬語氣。與現(xiàn)在相反的時候使用過去時（be動詞用were）；與過去相反使用過去完成時。本題是與現(xiàn)在相反，故使用過去時。句意：不要拿那個花瓶就好像它是鐵做的一樣。故C正確。
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