—Sorry ________ (step) on your foot!
—It doesn't matter.
to have stepped　
句意：——對不起，踩著你的腳了！——沒關(guān)系。sorry的基本句式是sorry to do sth.，又由于其動作發(fā)生在sorry之前，所以應(yīng)使用不定式的完成式。
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