A new __________ bus service to Tianjin Airport started to operate two months ago.
A. normal B. usual
C. regular D. common
A new __________ bus service to Tianjin Airport started to operate two months ago.
A. normal B. usual
C. regular D. common
C
根据常识,公交车通常是往返于某一固定的线路,故选regular最合适。