专四
A.could have been
B.would be
C.will be
D.would have been
【解析】考查虚拟语气。本题表示与现在事实相反的假设。表示与现在事实相反,条件从句用一般过去时,主句使用should(would)+动词原形。A项could have been是对过去事实的假设,与从句所表示的现在事实不吻合;C项will不可以用于虚拟语气中;D是与过去事实相反的假设的虚拟语气从句形式。此三项均与题意不符。
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