题目内容
20.Unless the weather______,we'll have to cancel the picnic.( )| A. | improve | B. | improves | C. | improved | D. | will improve |
分析 除非天气有所改善,否则我们必须取消野餐.
解答 答案:B
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.
点评 明确句意,掌握unless的用法便可做出正确答案.
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