We'll have a picnic in the park this Sunday ________ it rains or it's very cold.
A.sinceB.ifC.unlessD.until
C

句意:除非下雨或天很冷,我們將在本周日去公園野餐。從句子之間的邏輯關系判斷此處應為否定條件句,相當于if...not,故排除if,而選unless。A項since表因果關系。D項until只能引導時間狀語從句,故排除。
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