标题: 请教一道题目 [打印本页] 作者: big7474 时间: 2012-2-26 21:58 标题: 请教一道题目 On the Great Plains, nineteenth-century settlers uesd mud and grass to build their homes, doing it without timbers and nails. A. settlers used mud and grass to build their homes, doing it without B. settlers used mud and grass to build their homes, did it without C. settlers used mud and grass to build their homes, making them while not having D. settlers used mud and grass to build their homes, making do without E. settler's homes were built of mud and grass ,making do without