题目

They agreed to lend us the car __________ we returned it before the weekend. A . even though B . as though C . on condition that D . if only 答案：C暑假期间，嘉嘉和明明去参加游泳训练．嘉嘉每隔6天去一次，明明每隔8天去一次．7月28日两人同时参加了游泳训练，他们再次一起参加训练是 ．