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【问】[503]2009年英语专业四级考试(TEM-4)中的这道选择题(Aren’t you tired?I——you had done enough for today.A.should have thought B.must liave thought C.might have thought D.could have thought)为什么选A呢?“should+不定式完成体”不是表示“本应该做某事而实际上并没有做”吗?