the cost of dry-cleaning is three times that of ordinary washing 这句话有没有语法错误?

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the cost of dry-cleaning is three times that of ordinary washing 这句话有没有语法错误?

the cost of dry-cleaning is three times that of ordinary washing 这句话有没有语法错误?
the cost of dry-cleaning is three times that of ordinary washing 这句话有没有语法错误?

the cost of dry-cleaning is three times that of ordinary washing 这句话有没有语法错误?
the cost of dry-cleaning is three times 【as much as】that of ordinary washing