题目内容：
It wasn't long before most of the school districts that experimented with single-sex education abandoned the practice.参考答案：
答案解析：
单选题：It wasn't long before most of the school districts that exp
- 题目分类：英语六级
- 题目类型：单选题
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第(43)题__________
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联合运输按运输对象分类可分为货物联运和（ ）。
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