【題目】She says that she'll have to close the shop ________ business improves.
A.if
B.unless
C.after
D.when

【答案】B
【解析】句意：她說(shuō)她將不得不關(guān)掉商店，如果生意不提高的話。A. if如果，B. unless除非，如果不，C. after在…后面，D. when當(dāng)…時(shí)候，選B。

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