新概念英語第四冊課后練習(xí)答案：Unit 11 -Unit 20
Unit 11 AABDD DADDB DD
Unit 12 CABAC CDACA AB
Unit 13 ACDAC BDABC AD
Unit 14 DBDCC ACCBD BD
Unit 15 CADCD DBACA CA
Unit 16 ABCCA DDBAB AC
Unit 17 BBADA BBDCD CA
Unit 18 BABCD CDCCC BA
Unit 19 BBCAD AABDD BC
Unit 20 BCADC CCBDB CA
Unit 11 AABDD DADDB DD
Unit 12 CABAC CDACA AB
Unit 13 ACDAC BDABC AD
Unit 14 DBDCC ACCBD BD
Unit 15 CADCD DBACA CA
Unit 16 ABCCA DDBAB AC
Unit 17 BBADA BBDCD CA
Unit 18 BABCD CDCCC BA
Unit 19 BBCAD AABDD BC
Unit 20 BCADC CCBDB CA