问题描述：
一道 SAT 语法题
For more than a century,wooden ships called "skipjacks" were regularly used to harvest oysters in Chesapeake Bay, but only a few such vessels remain in service today.
答案是没错
For+时间段,不是应该用完成时吗?这里用过去时为什么是对的?
For more than a century,wooden ships called "skipjacks" were regularly used to harvest oysters in Chesapeake Bay, but only a few such vessels remain in service today.
答案是没错
For+时间段,不是应该用完成时吗?这里用过去时为什么是对的?
问题解答：
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