看答案网Factoriesthrewrubbishintoriversafewyearsago．（改为被动语态）Rubbishintoriversbyfactoriesafewyearsago．
Factories threw rubbish into rivers a few years ago．（改为被动语态）
Rubbish______into rivers by factories a few years ago．
Rubbish______into rivers by factories a few years ago．
参考答案
答案：was thrown．主语rubbish是动词throw的承受者，构成被动语态，结合时间状语 a few years ago表示的是过去的时间，故用一般过去时的被动语态was/were+过去分词，主语是不可数名词，故was，throw的过去分词是thrown，故答案是was thrown．
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