18. A new ___ bus service to Tianjin Air
题型:选择题
问题:
18. A new ___ bus service to Tianjin Airport started to operate two months ago .
A.normal
B.usual
C.regular
D.common
18. A new ___ bus service to Tianjin Airport started to operate two months ago .
A.normal
B.usual
C.regular
D.common