【題目】—You look so worried, Cathy. What’s the matter?

—I will have to close my store _________ my business improves.

A. if B. since C. until D. unless

【答案】D

【解析】

句意：——你看起來如此擔(dān)心，怎么了？——我必須關(guān)閉我的商店，除非我的生意有所改善。A. if如果；B. since自從；C. until直到；D. unless除非。這里是unless引導(dǎo)的條件狀語從句，遵循主句用一般將來時，從句用一般現(xiàn)在時態(tài)。根據(jù)題意，故選D。

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