Susan might have come to school in time for Professor Browni

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Susan might have come to school in time for Professor Browning's lecture,________
Susan might have come to school in time for Professor Browning’s lecture,________.
A.but he got up rather late B.but he had got up so late
C.if he got up earlier D.unless he had got up earlier
为什么选A 而不是其它答案

他也许就来听来了布朗教授的讲座了,如果他起床早一点,（但实际上他起床相当晚）
这道题是个虚拟语气的句子.对过去的事情进行假设.
主句用would/ could/ might/ have done.
从句用had done.
所以原题实际上是这样：
Susan might have come to school in time for Professor Browning’s lecture,if he had got up earlier.（but he got up rather late）.
用but表示的是实际上起的相当晚,就不用虚拟了,所以只用能过去时.
不选C,用if就得用虚拟,那c的时态就不对了.
这样讲不知你明白了没有?

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