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

问题补充：

The sports meeting will continue it rains this afternoon.

A. if

B. since

C. though

D. unless

答案：

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。