there —a lot of rubbish in this river.(is,are)选词填空

there —a lot of rubbish in this river.(is,are)选词填空
there —a lot of rubbish in this river.(is,are)选词填空

there —a lot of rubbish in this river.(is,are)选词填空
is
主语a lot of rubbish 不可数,谓语用单数
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is