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We _____ last night,but we went to appreciate the flowerbeds and streetlights in Tian’anmen Square instead.?
A.might studyB.could study?
C.should have studiedD.must have studied?
 C
  考查虚拟语气。依据题干中的last night可知,A、B两项错误,此处不是表猜测;而must have done表示“一定做过某事”,不符合句意;should have done表示“本应该做某事而没做”。
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