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    She says that she’ll have to close the shop ________ business improves.

    A．if B．unless C．after D．when 

    B

    解析试题分析：句意：她说她将不得不关闭商店，除非业务有所提高。if   如果；unless   除非；after在……之后； when当……的时候。由题意可知，选B。 
    考点: 考查连词的用法。

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