Barges which carrier most of the heavy freight on rivers and canals are usually propelled by towing.

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问题 Barges which carrier most of the heavy freight on rivers and canals are usually propelled by towing.

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答案carrier一carry

解析 译文:在水道和运河上承栽大多数重货的驳船通常是靠拖力来驱动的。
分析:考查词性。carrier是名词,意为“运送者;货运公司”。而此处which引导的定语从句中需要谓语动词,主语Barges是复数形式,故将carrier改为carry。
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