ABA×CC=CCCC A=( ) B=( ) C=( )

what abaout Ron and betty?
这一段话是 Did you swim across the river last week?
yes I swam across the river last week
what about Ron and Betty?
they haven't swum across the river yet
这句是话翻译中文是“伱上个星期游过那河了吗？是的 上个星期我游过了那条河”对吗？
惭愧英语没学好

aba 乘 b = bdcc ;
aab 乘 7b = b40a .