It was porters and large or small horse caravans that brought back and forth goods inclu-ding tea , horses , fur and traditional Tibetan medicine along the Road.
这里porters and caravans明显是复数,是因为看成整体所以用it来强调吗?
强调句型 It is/was... that...中,it的使用和被强调部分为单数或复数无关。
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