Despite a growing population, in 1998 the United States used 38 billion fewer gallons of water a day when comparing it to the period of all-time highest consumption almost 20 years earlier.
day when comparing it to the period of all-time highest consumption almost 20 years earlier
day than it did during the period of all-time highest consumption almost 20 years earlier
day than were used almost 20 years earlier, which had been the alltime high consumption
day, compared to almost 20 years earlier, that having been the alltime high consumption
day, which is in comparison to the period of all-time highest consumption almost 20 years earlier
出现比较级,必须出现than
C were used 使用了被动 导致前后主语不对等不能说美国were used
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