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

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( ) 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
if 表示虚拟语气,是否用if he had got up early
( ) 15.Tom might have come to school in time for Professor B
这个问题你问了几次了
这个是过去时的虚拟语气,它的形式为
从句,if+were/had done,主句:主语+would/might/+have+done
所以当然选A了