语法上没错!主语从句改为过去完成时较好,即：That he 【had passed】 the exam
不过更习惯于说：
The reason why his parents were pleased was that he had passed the exam
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如果本题有什么不明白可以追问,所以说，我这样子写是对的咯?我被我们老师骗了，她也有说到“The reason why his parents were pleased was that he had passed the exam ”，但是我个人在听电影之类的时候一般只听到我所写的那种说法，那也只是一点点印象而已。所以我写那个是一定对吧？没错的！！