But too much of that lengthened experience,even in the wealthy West,will be experience of poverty and neglect,______we do someth

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问题 But too much of that lengthened experience,even in the wealthy West,will be experience of poverty and neglect,______we do something about it.

选项 A、when
B、Unless
C、because
D、if

答案B

解析 很多经验表明,即使在富饶的西方,也有贫穷和被忽略的经历,除非我们能为此做些什么。依题意选B。
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