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【题目】—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:——你看起来如此担心,怎么了?——我必须关闭我的商店,除非我的生意有所改善。A. if如果;B. since自从;C. until直到;D. unless除非。这里是unless引导的条件状语从句,遵循主句用一般将来时,从句用一般现在时态。根据题意,故选D。

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