She says that she'll have to close the shop ________ business improves.
A．ifB．unlessC．a(chǎn)fterD．when
B

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)…時候，句意：她說她將不得不關(guān)掉商店，如果生意沒有改善的話。選B。
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