have + p.p. 叫做現在完成式,代表從以前一直延續到現在的效果,所以+Ving比較好(had + p.p.代表過去已經完成,故叫過去完成式)
這題為何不用關係代名詞,連接詞已經有for,還有coming from out of town是用來修飾student participants完全屬於可有可無,所以不用
The school administrators have arranged the accommodations for student participants coming from out of town.
The school administrators have arranged ..-阿摩線上測驗