【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(dǎo)一個(gè)表假設(shè)的條件狀語(yǔ)從句,在含有條件狀語(yǔ)從句的復(fù)合句中,如果主句是一般將來(lái)時(shí),從句用一般現(xiàn)在時(shí)表將來(lái),從句的主語(yǔ)the weather是第三人稱單數(shù),所以謂語(yǔ)動(dòng)詞用單三形式,故選B.

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