试题分析:①∵F是AD的中点,∴AF=FD,∵在▱ABCD中,AD=2AB,∴AF=FD=CD,∴∠DFC=∠DCF,∵AD∥BC,∴∠DFC=∠FCB,∴∠DCF=∠BCF,∴∠BCD,故此选项正确;延长EF,交CD延长线于M,∵四边形ABCD是平行四边形,∴AB∥CD,∴∠A=∠MDE,∵F为AD中点,∴AF=FD,在△AEF和△DFM中,,∴△AEF≌△DME(ASA),∴FE=MF,∠AEF=∠M,∵CE⊥AB,∴∠AEC=90°,∴∠AEC=∠ECD=90°,∵FM=EF,∴FC=FM,故②正确;③∵EF=FM,∴S△EFC=S△CFM,∵MC>BE,∴S△BEC<2S△EFC,故S△BEC=2S△CEF错误;④设∠EFC=x,则∠FCE=x,∴∠DCF=∠DFC=90°-x,∴∠EFC=180°-2x,∴∠EFD=90°-x+180°-2x=270°-3x,∵∠AEF=90°-x,∴∠DFE=3∠AEF,故此选项正确.故答案为:①②④.
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