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

A．if B．unless C．a(chǎn)fter D．when

B

解析試題分析：考查連詞：A. if如果，B. unless除非，如果不，C. after在…后面，D. when當(dāng)…時(shí)候，句意：她說(shuō)她將不得不關(guān)掉商店，如果生意沒(méi)有改善的話。選B。
考點(diǎn)：考查連詞

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