来自史彩成的问题
1()Theboysareplayingfootball_____thegirlsaresinginganddancing.AasBwhenCbeforeDwhile
1()Theboysareplayingfootball_____thegirlsaresinginganddancing.
AasBwhenCbeforeDwhile


1()Theboysareplayingfootball_____thegirlsaresinginganddancing.AasBwhenCbeforeDwhile
1()Theboysareplayingfootball_____thegirlsaresinginganddancing.
AasBwhenCbeforeDwhile
()Theboysareplayingfootballwhilethegirlsaresinginganddancing.
AasBwhenCbeforeDwhile
while引导的时间状语从句用进行时态.
我是英语教师,不明可再问.