We were told that we should follow the main road ________ we reached the central railway station．

1. A.
   whenever
2. B.
   until
3. C.
   while
4. D.
   wherever

We were told that we should follow the main road__________we reached the central railway station .

A.whenever   B.until    C.while   D.wherever

We were told that we should follow the main road ___ we reached the central railway station.

    A. whenever      B. until          C. while         D. wherever

We were told that we should follow the main road__________ we reached the central railway station.

A. whenever　　　                                          B. until　　　　          

C. while　　　　                                            D. wherever