—Could you tell me ?
—At the end of July.
A. how often he heard from his pen pal
B. how soon he will be here
C. that he went on vacation
D. when you will start your vacation
—Could you tell me ?
—At the end of July.
A. how often he heard from his pen pal
B. how soon he will be here
C. that he went on vacation
D. when you will start your vacation
D 由答语句意“在七月底”可知，宾语从句的内容是询问时间的，故只有D项（你的假期将什么时候开始）符合语境。