∵∠B和∠ACD都是∠CAB的余角,∴∠ACD=∠B,故①正确;∵CD⊥AB,EF⊥AB,∴EF∥CD,∴∠AEF=∠CHE,∴∠CEH=∠CHE,∴CH=CE=EF,故②正确;∵角平分线AE交CD于H,∴∠CAE=∠BAE,在△ACE和△AEF中, ∠CAE=∠FAE ∠ACE=∠AFE=90° AE=AE ,∴△ACE≌△AFE(AAS),∴AC=AF,故③正确;CH=CE=EF>HD,故④错误.故正确的结论为①②③.故选B.