12[单选题,1.3分] ________ he known that it was to be the president’s last press conference, he would have filmed the occasion. A.Should B.If C.Were D. Had

12[单选题,1.3分] ________ he known that it was to be the president’s last press conference, he would have filmed the occasion.
A.Should
B.If
C.Were
D. Had

出自：河南大学-本科英语

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