It was the first time that _ _ _ _ _.这是他第一次输了比赛.

It was the first time that he lost the game/match.
不明白的欢迎再问!请记得采纳,要五个空的。如果五个空，应该怎么填？谢谢你啊~啊！瞧我！我写错了。It is the first/second/third ... time that后面接现在完成时，It was the first/second/third ... time that后面接过去完成时。因此这题的正确答案是：It was the first time that he had lost the game/match.