原句中since then的then,是哪个时间点?句子中并没有给出时间点,所以说“从那时开始它慢慢地绝迹了”很奇怪.
我觉得C也有同样的问题
D的话,谓语变成了单数,主语是trains
个人认为选B
一道SAT语法题History textbooks are the only testimony to the fact
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