题目

如图，在正方体ABCD―A1B1C1D1中，P为BD1的中点，则△PAC在该正方体各个面上的射影可能是（   ）     A．①④         B．②③           C．②④         D．①② 答案：AI would have gone to the meeting if I ___ time. A. had had B. have had C. had D. would have had