Lesson 1:bcbdc adbac cc Lesson 2:cdcca bbadc db Lesson 3:cacac bccba bb Lesson 4:dbabb acbca cc Lesson 5:cadbc dabcb bd Lesson 6:dacdd adaba da Lesson 7:bccda cdacb ab Lesson 8:dbbac cbbad bb Lesson 9:cbdaa bbdbb dc Lesson 10:addcb cacac ca Lesson 11:bbbab ccacc bd Lesson 12:ccadd adacd aa Lesson :13 bdbca bbcaa ad Lesson 14:bcacd bcbcb bb Lesson 15:dbcbc dadcc cb Lesson 16:aadab adadd da Lesson 17:dbbdc cbaac ad Lesson18 :Bdbdb cdcac cb Lesson 19:Adccd bcbca cc Lesson 20:Bcbbc bcacc da 填空我可帮不了你了 答案补充 填空题似乎没有答案在官方