虚拟语气里的would have done为什么是have,为什么要把完成时加在里面?

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• 9.Unfortunately,when i dropped in ,proffesor smith( ),so we only had time for a few words.A.has just left B.has just leftC.just left D.was just leavingQ:have 时间发生在什么动作之前,是leave之前吗?用过去完成事态had+done,其参照点(过去的那个动作)不一定就用一般过去时态,还可以用哪些时态喃?最好有例句说明,thank you D 写掉了 我主要想问 为什么题中是so we only had time for a few words,里要用过去完成时态.
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• 过去将来完成时的结构