— Now I must go _______ I shall be late for the train.
— Have a good trip. Goodbye.

— Now I must go _______ I shall be late for the train.

— Have a good trip. Goodbye.

A．or               B．so               C．a(chǎn)nd              D．but

— Now I must go _______ I shall be late for the train.
— Have a good trip. Goodbye.

1. A.
   or
2. B.
   so
3. C.
   and
4. D.
   but

— Now I must go _______ I shall be late for the train.

— Have a good trip. Goodbye.

　 A. or　　　　 B. so 　　　　C. and　　　　　 D. but