【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…時候,選B。

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