Mike ________ to school in time for the visiting professor's lecture, but he missed his school bus．A.could have eB.could eC.might eD.couldn't have e
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A解析这句句子的意思是“迈克本来有可能准时到学校听客座教授的讲座，但是他没有赶上校车。”言下之意，如果赶上校车的话，就能准时到校。could have done就表示“本来可能做而事实上没有做的事”。因此，本句句子就相当于“If Mike hadn't missed the school bus, he could have e to school in time for the visiting professor's lecture．”