Airlines will________ to allow for the high number of________ ，but must exercise caution．
A.overbook, independent travelers B.overbook, no-shows C.underbook，business travelers D.underbook，repeat travelers正确答案B
Airlines will________ to allow for the high number of________ ，but must exercise caution．
A.overbook, independent travelers B.overbook, no-shows C.underbook，business travelers D.underbook，repeat travelers正确答案B
