问题描述：
再来一个英语选择,说下理由啊
Tom might have come to school in time for Professor Brown's lecture
A.if he got up earlier
B.but he got up rather late
C.unless he had got up earlier
D.but he had gotten up so late
Tom might have come to school in time for Professor Brown's lecture
A.if he got up earlier
B.but he got up rather late
C.unless he had got up earlier
D.but he had gotten up so late
问题解答：
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