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求教,99年专四选择一道thereoughttobelessanxietyovertheperceivedriskofmountainclimbingthaninthepublicmindtoday.AexitsBexistCexistingDtoexist答案选的是A,是因为than作了主语还是主语anxiety省略了?

题目详情
求教,99年专四选择一道
there ought to be less anxiety over the perceived risk of mountain climbing than __in the public mind today.A exits B exist Cexisting D to exist 答案选的是A,是因为than作了主语还是主语anxiety省略了?
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答案和解析
主语省略了.一个是实有的风险焦虑,另一个作比的是人们想当然的风险焦虑.全句铺展开应该是:
there ought to be less anxiety over the perceived risk of mountain climbing than the 【anxiety over the perceived risk of mountain climbing “which exists”】 in the public mind today