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On the Great Plains, nineteenth-century settlers used mud and grass to build their homes, doing it without timber and nails.
D. settlers used mud and grass to build their homes, making do without;
为什么答案选D, 而不选A.?????
写完了帖子,再一琢磨,知道错误所在了,呵呵:doing it 里的it没有指代对象,所以错了
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