There is some dust ()the floor填介词,是on还是in?

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Thereissomedust()thefloor填介词,是on还是in?Thereissomedust()thefloor填介词,是on还是in?Thereissomedust()thefloor填

There is some dust ()the floor填介词,是on还是in?
There is some dust ()the floor
填介词,是on还是in?

There is some dust ()the floor填介词,是on还是in?
on
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