17.
如图所示,点E在AC的延长线上,下列条件不能判定AB∥CD的是( )
0 283564 283572 283578 283582 283588 283590 283594 283600 283602 283608 283614 283618 283620 283624 283630 283632 283638 283642 283644 283648 283650 283654 283656 283658 283659 283660 283662 283663 283664 283666 283668 283672 283674 283678 283680 283684 283690 283692 283698 283702 283704 283708 283714 283720 283722 283728 283732 283734 283740 283744 283750 283758 366461
| A. | ∠1=∠2 | B. | ∠3=∠4 | C. | ∠A=∠DCE | D. | ∠A+∠2+∠4=180° |