英语翻译By the end of the six-hour cleanup,they (30)_____(remove

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英语翻译
By the end of the six-hour cleanup,they (30)_____(remove) enough garbage to fill more than two large trucks.―(31)_____(see) all that garbage in the river makes people begin to care about environmental issues,‖ Susan says.
30.had removed 31.Seeing
帮我翻译一下,

经过六小时的大扫除,他们清除了足够装两辆多大卡车的垃圾.by the end of +过去式,主语+过去完成时固定句式
“看到水里的垃圾使人们开始关心环保问题,”苏珊说.
现在分词作主语/状语.垂悬结构.谓语动词为make

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