--- How soon will you start your journey?
--- I'm not sure.  I haven't decided_______.

A．when shall I ask the boss for leave

B．where I will go to spend the holiday

C．if I would go by train or by plane

D．who should I travel with

科目 英语   题型 单选题   难度 中等

知识点： 主从复合句 宾语从句