Question

________ he returns to his native land________ he returns to his native land.

1. A.
   It is long before that
2. B.
   It is before long
3. C.
   It won't be long before
4. D.
   It will be before long that

Answer 1

C
It won't be long before…“不久就……”(主句中为将来时，时间状语从句中用一般现在时)．