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【题目】Unless the weather ______, we'll have to cancel the picnic.
A.improve
B.improves
C.improved
D.will improve

【答案】B
【解析】句意:除非天气有所改善,否则我们必须取消野餐. unless引导一个表假设的条件状语从句,在含有条件状语从句的复合句中,如果主句是一般将来时,从句用一般现在时表将来,从句的主语the weather是第三人称单数,所以谓语动词用单三形式,故选B.

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