9. ____ he will leave for Beijing. A. It will not long before B. It is before long that C. It is before long D. It was before long that答案是D选项.为什么不能选B选项

9. ____ he will leave for Beijing. A. It will not long before B. It is before long that C. It is before long D. It was before long that答案是D选项.为什么不能选B选项
9. ____ he will leave for Beijing.
A. It will not long before B. It is before long that C. It is before long D. It was before long that
答案是D选项.为什么不能选B选项

9. ____ he will leave for Beijing. A. It will not long before B. It is before long that C. It is before long D. It was before long that答案是D选项.为什么不能选B选项
答案错了吧,我也觉得是B