15. (单选题) If we ________ adequate preparations， the conference wouldn’t have been so successful.(本题5.0分) A、 haven’t made B、 wouldn’t make C、 didn’t make D、 hadn’t made

15. (单选题) If we ________ adequate preparations， the conference wouldn’t have been so successful.(本题5.0分)
A、 haven’t made
B、 wouldn’t make
C、 didn’t make
D、 hadn’t made

出自：陇东学院-大学英语2(专升本)

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