题目选项分析

According to research covering the last decade, the average number of rooms added by high-end hotel chains was lower than the hotel industry average for this period, but occupancy and room rates grew faster for these chains than for the average hotel.

According to research covering the last decade, the average number of rooms added by high-end hotel chains was lower than what the hotel industry average did for this period, but their occupancy and room rates grew faster than the average hotel.