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【題目】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:除非天氣有所改善,否則我們必須取消野餐. unless引導一個表假設的條件狀語從句,在含有條件狀語從句的復合句中,如果主句是一般將來時,從句用一般現在時表將來,從句的主語the weather是第三人稱單數,所以謂語動詞用單三形式,故選B.

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