The sports meeting will continue it rains this afternoon.A. ifB. since C. though D. unless

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A. if
B. since
C. though
(答案→)D. unless
解析：if是否，如果；since自从……以来；though虽然，尽管；unless除非，如果不。句意：如果今天下午不下雨，运动会就将继续。结合语境可知选D。