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SAT语法IntheUnitedStates,theindustrialuseofplasticsisgreater(thansteel),aluminum,andcoppercombined.Noerror.括号怎么错了?

题目详情
SAT 语法
In the United States,the industrial use of plastics is greater( than steel),aluminum,and copper combined.No error.括号怎么错了?
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答案和解析
than用作介词,意为比较,且比较的事物应为一类事物,如该句,应该是塑料的工业用途比钢的用途更广,是两个事物的用途之间比较,而不能把塑料的工业用途直接与钢相比较,不合逻辑
应该是the industrial use of plastibs is greater than that of steel.