Question

—How soon could they cover the distance?
—____________

1. A.
   For two hours
2. B.
   During the two hours
3. C.
   After two hours
4. D.
   In two hours

Answer 1

D
句意：他们多久能走完这段距离。两个小时之后。In + 时间段，表示将来，根据语境所以选D。