【題目】It might have saved me some trouble ______ the schedule.
A.did I know
B.have I known
C.do I know
D.had I known

【答案】D
【解析】句意：如果我早知道日程安排，可能會(huì)省去我一些麻煩。根據(jù)might have saved可知主句是對(duì)過(guò)去的虛擬，從句應(yīng)用if I had known與主句保持一致。if虛擬條件句中含有had時(shí)，可將if省去，同時(shí)將had提前構(gòu)成倒裝結(jié)構(gòu)。故選D項(xiàng)。

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