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thereoughttobelessanxietyovertheperceivedriskofgettingcancerthaninthepublicmindtoday答案填exists我的疑问是时态

题目详情
there ought to be less anxiety over the perceived risk of getting cancer than ____ in the public mind today
答案填exists 我的疑问是时态
▼优质解答
答案和解析
exists前面的名词主语应该是anxiety,不可数.