单选题 Public transportation in many parts of North America is inadequate, ＿＿＿＿＿＿ owning a car is a necessity for many people. 的答案

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题目内容：
Public transportation in many parts of North America is inadequate, ＿＿＿＿＿＿ owning a car is a necessity for many people.
题目选项

nevertheless

so that