This MP4 was very expensive.lt _(cost) me over 800 yuan.

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ThisMP4wasveryexpensive.lt_(cost)meover800yuan.ThisMP4wasveryexpensive.lt_(cost)meover800yuan.ThisMP

This MP4 was very expensive.lt _(cost) me over 800 yuan.
This MP4 was very expensive.lt _(cost) me over 800 yuan.

This MP4 was very expensive.lt _(cost) me over 800 yuan.
cost
过去式跟原形是一样的

cost--cost--cost