答案:Unit1 Topic11-5 CBACA 6-10 DBBCB 11-15 ABDAC 16-20 BDBCDTopic21-5 BACAC 6-10 DCBCD 11-15 ABDCB 16-21 DADDACTopic31-5 CBCCB 6-10 ABBBC 11-15 BCBDA 16-20 DBBDCUnit2 Topic11-5 DACDD 6-10 ABCBC 11-15 DDBDB 16-19 ADCC
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