Professor Smith teaches English in our college. He
has a lovely car and drives to work every morning. Last Tuesday, however, there
was something wrong with the car, so Professor Smith had to come to school by
bus. He left home 40 minutes earlier than usual and arrived at school half an
hour late. Poor Professor! Why was Professor Smith late last Tuesday
A. He got up late in the morning.
B. He took the wrong bus.
C. His car broke down and the bus run very slowly.