求教英语选择题,麻烦详解一下C选项
Son:Father,youpromisedthatifIdidwellintheexamyouwouldbuymeanewbike.
Father:________Iwillbuyittomorrow.
A.SodidI.x05x05x05x05x05
B.Really?
C.SoIdid.x05x05x05x05x05
D.Youshouldkeepyourpromise.