Could you tell me---?A.when will they leave Beijing.B.when could they leave BeijingC.when they will leave BeijingD.why she did't come to school

问题描述:

Could you tell me---?A.when will they leave Beijing.B.when could they leave Beijing
C.when they will leave BeijingD.why she did't come to school

C
宾语从句后跟陈述语序

应选C,宾语从句应该用陈述的语序(连词+主语+谓语),而且这里的could表示委婉的语气,不表过去,他们还没有离开北京,所以应该用将来时态.