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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:考查连词:A. if如果,B. unless除非,如果不,C. after在…后面,D. when当…时候,句意:她说她将不得不关掉商店,如果生意没有改善的话。选B。
考点:考查连词

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