( ) 15. Tom might have come to school in time for Professor

( ) 15. Tom might have come to school in time for Professor Brown's lecture, .
( ) 15. Tom might have come to school in time for Professor Brown's lecture, ______ .
A. if he got up early B. unless he had got up early
C. but he got up rather late D. but he had got up so late
是否能选D用过去完成时

A

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