They will try their best in the Dragon Boat Racing they may fail.A. ifB. thoughC. untilD.

问题补充：

They will try their best in the Dragon Boat Racing they may fail.

A. if

B. though

C. until

D. when

答案：

A. if

(答案→)B. though

C. until

D. when

解析：句意：他们会尽一切努力的，尽管他们在龙舟竞赛中可能会失败。if如果；though尽管；until直到；when 当……的时候。由句意可知空格处，应是表示转折的连词，因此选B。

考点: 考查状语从句的连词的用法。