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问题: 选择

ford might have come to school in time for Professor Smith's lecture,______.
A.if he got up earlier
B.unless he had got up earlier
C.but he got up rather late
D.but he had got up so late

解答:

我认为是C
原体里说Ford本可以准时出席教授的演讲么,C说的是客观现实,用过去时态。