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【題目】If we _______ adequate preparations, the conference wouldn't have been so successful.
A.haven't made
B.wouldn't make
C.didn't make
D.hadn't made

【答案】D
【解析】句意：如果我們沒有做好充分的準備，會議就不會這樣成功。在虛擬條件句中，表示與過去事實相反的情況，從句用過去完成時，主句用would have done的形式。故選D。

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