She says that she’ll have to close the shop ________ business improves.(2013·江西，28)
A．ifB．unless
C．a(chǎn)fterD．when
B
解析　本題考查狀語從句的引導(dǎo)詞。句意為：她說，除非生意好轉(zhuǎn)，否則她只能關(guān)掉店鋪。if如果；unless除非，如果不……；after在……之后；when當(dāng)……的時候。根據(jù)句意，B項符合題意。
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