【題目】It might have saved me some trouble ______ the schedule.
A.didIknow
B.haveIknown
C.doIknow
D.hadIknown

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

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