Mary and her classmates are going a social stMary and her classmates are going a social studies field trip.这道题填什么呢?
问题描述：
Mary and her classmates are going a social st
Mary and her classmates are going a social studies field trip.这道题填什么呢?
答
答案：on
go on a...trip进行一次……的旅行.
句意：玛丽和她的同学们将要进行一次社会实验方面的旅行.