I'm sure he will be back __.just wait a minute.

问题描述:

I'm sure he will be back __.just wait a minute.
A.long before B.before long C.after long D.long after

I'm sure he will be back (B.before long).Just wait a minute.
我肯定他不久就会回来的.就再等一下吧.
before long,不久以后.