句法知识提示该空为名词；从语境中几个并列的名词内容(商品、服务、工作)以及该空后面的of living来看，可-找考题网

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【参考答案】

L

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A．In 15th century.B．In the 17th, century.C．Before 15th century.D．After 17th century.

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