Until the 1840's, practically the only pioneers who had ventured to the western United States were trappers and a little explorers.
答案是D。是不是应该将a去掉呢?
举报
...平行结构
and前后要一致
比如说你题目中AND前是名词而AND后是名词短语
故不对
还是没搞清楚……
应该怎么改正啊?
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